Mycoses

SAN DIEGO – Health care workers with latent tuberculosis infection (LTBI) were significantly more likely to continue a shorter course of weekly rifapentine plus isoniazid (INH) than daily INH monotherapy, researchers reported at an annual scientific meeting on infectious diseases.

“Consideration should be given to no longer routinely recommending INH for the treatment of LTBI among health care workers,” said Dr. Esther Arguello Perez of Memorial Sloan Kettering Cancer Center, New York.

©CDC/Elizabeth

Health care workers face a greater risk of TB infection than the general population, regardless of the income level in the country where they live; patients with undiagnosed laryngeal or pulmonary TB usually pose the greatest risk, especially during procedures that cause coughing, such as sputum induction and bronchoscopy (Int J Tuberc Lung Dis. 2007;11[6]:593-605).

Although occupational TB testing is routine in U.S. health care organizations, more than half of health care workers who start treatment for LTBI historically have failed to finish (Chest. 2010;137[2]:401-9. doi: 10.1378/chest.09-0394). The standard LTBI regimen – 300 mg INH daily for 9 months – has been linked to potentially intolerable adverse effects such as hepatotoxicity, persistent gastrointestinal symptoms, rash, and neuropsychiatric problems (Drug Healthc Patient Saf. 2014;6:145-9. doi: 10.2147/DHPS.S68837).

In a 2011 multicenter trial, investigators reported a significantly higher completion rate for weekly rifapentine plus INH (900 mg each; 82% vs. 69% for daily INH; P < .001). Rates of adverse effects were significantly lower with weekly rifapentine plus INH, although grade 3-4 events and risk of death did not differ between the groups (N Engl J Med. 2011;365:2155-66. doi: 10.1056/NEJMoa1104875). The results of that trial quickly transformed recommendations for LTBI treatment (MMWR. 2011:60(48);1650-53).

Memorial Sloan Kettering implemented weekly rifapentine plus INH for its LTBI personnel in 2011. By 2014, about three-quarters of personnel with LTBI received rifapentine plus INH, while the rest were evenly split between rifampin and INH monotherapy, Dr. Arguello Perez reported at the combined annual meetings of the Infectious Diseases Society of America, the Society for Healthcare Epidemiology of America, the HIV Medicine Association, and the Pediatric Infectious Diseases Society.

To understand how health care workers’ attitudes and treatment acceptance shifted along with practice, the investigators reviewed records from all health care workers at Memorial Sloan Kettering who were diagnosed with LTBI for 2005-2014. Among 930 patients, only 357 (38%) accepted treatment, although 76% of these individuals finished the regimen they started, she noted. Rifapentine plus INH had the highest completion rate (88%), significantly exceeding rates for a 4-month course of daily rifampin (84%) and for 9 months of INH monotherapy (70%; P < .01 for both differences). In contrast, completion rates for rifampin and INH did not significantly differ, Dr. Arguello Perez said.

Notably, LTBI treatment completion rates among health care workers rose by 26% between 2013, when most prescriptions were for rifampin or INH monotherapy, and 2014, when most were for rifapentine plus INH. “Health care workers might be more likely to accept treatment for LTBI if they know about alternatives to INH,” she concluded.

Dr. Arguello Perez and her associates reported no funding sources and had no financial disclosures.

SAN DIEGO – Health care workers with latent tuberculosis infection (LTBI) were significantly more likely to continue a shorter course of weekly rifapentine plus isoniazid (INH) than daily INH monotherapy, researchers reported at an annual scientific meeting on infectious diseases.

“Consideration should be given to no longer routinely recommending INH for the treatment of LTBI among health care workers,” said Dr. Esther Arguello Perez of Memorial Sloan Kettering Cancer Center, New York.

©CDC/Elizabeth

Health care workers face a greater risk of TB infection than the general population, regardless of the income level in the country where they live; patients with undiagnosed laryngeal or pulmonary TB usually pose the greatest risk, especially during procedures that cause coughing, such as sputum induction and bronchoscopy (Int J Tuberc Lung Dis. 2007;11[6]:593-605).

Although occupational TB testing is routine in U.S. health care organizations, more than half of health care workers who start treatment for LTBI historically have failed to finish (Chest. 2010;137[2]:401-9. doi: 10.1378/chest.09-0394). The standard LTBI regimen – 300 mg INH daily for 9 months – has been linked to potentially intolerable adverse effects such as hepatotoxicity, persistent gastrointestinal symptoms, rash, and neuropsychiatric problems (Drug Healthc Patient Saf. 2014;6:145-9. doi: 10.2147/DHPS.S68837).

In a 2011 multicenter trial, investigators reported a significantly higher completion rate for weekly rifapentine plus INH (900 mg each; 82% vs. 69% for daily INH; P < .001). Rates of adverse effects were significantly lower with weekly rifapentine plus INH, although grade 3-4 events and risk of death did not differ between the groups (N Engl J Med. 2011;365:2155-66. doi: 10.1056/NEJMoa1104875). The results of that trial quickly transformed recommendations for LTBI treatment (MMWR. 2011:60(48);1650-53).

Memorial Sloan Kettering implemented weekly rifapentine plus INH for its LTBI personnel in 2011. By 2014, about three-quarters of personnel with LTBI received rifapentine plus INH, while the rest were evenly split between rifampin and INH monotherapy, Dr. Arguello Perez reported at the combined annual meetings of the Infectious Diseases Society of America, the Society for Healthcare Epidemiology of America, the HIV Medicine Association, and the Pediatric Infectious Diseases Society.

To understand how health care workers’ attitudes and treatment acceptance shifted along with practice, the investigators reviewed records from all health care workers at Memorial Sloan Kettering who were diagnosed with LTBI for 2005-2014. Among 930 patients, only 357 (38%) accepted treatment, although 76% of these individuals finished the regimen they started, she noted. Rifapentine plus INH had the highest completion rate (88%), significantly exceeding rates for a 4-month course of daily rifampin (84%) and for 9 months of INH monotherapy (70%; P < .01 for both differences). In contrast, completion rates for rifampin and INH did not significantly differ, Dr. Arguello Perez said.

Notably, LTBI treatment completion rates among health care workers rose by 26% between 2013, when most prescriptions were for rifampin or INH monotherapy, and 2014, when most were for rifapentine plus INH. “Health care workers might be more likely to accept treatment for LTBI if they know about alternatives to INH,” she concluded.

Dr. Arguello Perez and her associates reported no funding sources and had no financial disclosures.

SAN DIEGO – Health care workers with latent tuberculosis infection (LTBI) were significantly more likely to continue a shorter course of weekly rifapentine plus isoniazid (INH) than daily INH monotherapy, researchers reported at an annual scientific meeting on infectious diseases.

“Consideration should be given to no longer routinely recommending INH for the treatment of LTBI among health care workers,” said Dr. Esther Arguello Perez of Memorial Sloan Kettering Cancer Center, New York.

©CDC/Elizabeth

Health care workers face a greater risk of TB infection than the general population, regardless of the income level in the country where they live; patients with undiagnosed laryngeal or pulmonary TB usually pose the greatest risk, especially during procedures that cause coughing, such as sputum induction and bronchoscopy (Int J Tuberc Lung Dis. 2007;11[6]:593-605).

Although occupational TB testing is routine in U.S. health care organizations, more than half of health care workers who start treatment for LTBI historically have failed to finish (Chest. 2010;137[2]:401-9. doi: 10.1378/chest.09-0394). The standard LTBI regimen – 300 mg INH daily for 9 months – has been linked to potentially intolerable adverse effects such as hepatotoxicity, persistent gastrointestinal symptoms, rash, and neuropsychiatric problems (Drug Healthc Patient Saf. 2014;6:145-9. doi: 10.2147/DHPS.S68837).

In a 2011 multicenter trial, investigators reported a significantly higher completion rate for weekly rifapentine plus INH (900 mg each; 82% vs. 69% for daily INH; P < .001). Rates of adverse effects were significantly lower with weekly rifapentine plus INH, although grade 3-4 events and risk of death did not differ between the groups (N Engl J Med. 2011;365:2155-66. doi: 10.1056/NEJMoa1104875). The results of that trial quickly transformed recommendations for LTBI treatment (MMWR. 2011:60(48);1650-53).

Memorial Sloan Kettering implemented weekly rifapentine plus INH for its LTBI personnel in 2011. By 2014, about three-quarters of personnel with LTBI received rifapentine plus INH, while the rest were evenly split between rifampin and INH monotherapy, Dr. Arguello Perez reported at the combined annual meetings of the Infectious Diseases Society of America, the Society for Healthcare Epidemiology of America, the HIV Medicine Association, and the Pediatric Infectious Diseases Society.

To understand how health care workers’ attitudes and treatment acceptance shifted along with practice, the investigators reviewed records from all health care workers at Memorial Sloan Kettering who were diagnosed with LTBI for 2005-2014. Among 930 patients, only 357 (38%) accepted treatment, although 76% of these individuals finished the regimen they started, she noted. Rifapentine plus INH had the highest completion rate (88%), significantly exceeding rates for a 4-month course of daily rifampin (84%) and for 9 months of INH monotherapy (70%; P < .01 for both differences). In contrast, completion rates for rifampin and INH did not significantly differ, Dr. Arguello Perez said.

Notably, LTBI treatment completion rates among health care workers rose by 26% between 2013, when most prescriptions were for rifampin or INH monotherapy, and 2014, when most were for rifapentine plus INH. “Health care workers might be more likely to accept treatment for LTBI if they know about alternatives to INH,” she concluded.

Dr. Arguello Perez and her associates reported no funding sources and had no financial disclosures.

The expansion of the solar energy industry in Coccidioides-endemic areas of the southwestern United States is exposing more workers to the infection, say the authors of a study that found an attack rate of 1.2 cases per 100 workers.

A study among 3,572 workers at two solar power–generating facilities in California identified 44 individuals with the infection between October 2011 and April 2014, 9 of whom were hospitalized, according to a paper published in the Oct. 14 edition of Emerging Infectious Diseases.

Courtesy CDC/ Lucille Georg

The disease is acquired through inhalation of the soil-dwelling Coccidioides fungus spores and while the majority of the patients said they had received safety training about the risk of coccidioidomycosis, only six of those who regularly performed soil-disruptive work reported regularly using respiratory protection (Emerg Infect Dis. 2015 Oct 14; doi: ).

“Large-scale construction, including solar farm construction, might involve substantial soil disturbance for months, and many employees, particularly from non–Coccidioides-endemic areas, probably lack immunity to Coccidioides,” wrote Jason A. Wilken, Ph.D., of the Centers for Disease Control and Prevention, and his coauthors.

“Medical providers should consider work-related coccidioidomycosis when evaluating construction workers with prolonged febrile respiratory illness, particularly after work in Central or Southern California or in Arizona, and medical providers should follow all statutory requirements for documenting and reporting occupational illness,” Dr. Wilken concluded.

The study was supported by the Centers for Disease Control and Prevention. No conflicts of interest were declared.

The expansion of the solar energy industry in Coccidioides-endemic areas of the southwestern United States is exposing more workers to the infection, say the authors of a study that found an attack rate of 1.2 cases per 100 workers.

A study among 3,572 workers at two solar power–generating facilities in California identified 44 individuals with the infection between October 2011 and April 2014, 9 of whom were hospitalized, according to a paper published in the Oct. 14 edition of Emerging Infectious Diseases.

Courtesy CDC/ Lucille Georg

The disease is acquired through inhalation of the soil-dwelling Coccidioides fungus spores and while the majority of the patients said they had received safety training about the risk of coccidioidomycosis, only six of those who regularly performed soil-disruptive work reported regularly using respiratory protection (Emerg Infect Dis. 2015 Oct 14; doi: ).

“Large-scale construction, including solar farm construction, might involve substantial soil disturbance for months, and many employees, particularly from non–Coccidioides-endemic areas, probably lack immunity to Coccidioides,” wrote Jason A. Wilken, Ph.D., of the Centers for Disease Control and Prevention, and his coauthors.

“Medical providers should consider work-related coccidioidomycosis when evaluating construction workers with prolonged febrile respiratory illness, particularly after work in Central or Southern California or in Arizona, and medical providers should follow all statutory requirements for documenting and reporting occupational illness,” Dr. Wilken concluded.

The study was supported by the Centers for Disease Control and Prevention. No conflicts of interest were declared.

The expansion of the solar energy industry in Coccidioides-endemic areas of the southwestern United States is exposing more workers to the infection, say the authors of a study that found an attack rate of 1.2 cases per 100 workers.

A study among 3,572 workers at two solar power–generating facilities in California identified 44 individuals with the infection between October 2011 and April 2014, 9 of whom were hospitalized, according to a paper published in the Oct. 14 edition of Emerging Infectious Diseases.

Courtesy CDC/ Lucille Georg

The disease is acquired through inhalation of the soil-dwelling Coccidioides fungus spores and while the majority of the patients said they had received safety training about the risk of coccidioidomycosis, only six of those who regularly performed soil-disruptive work reported regularly using respiratory protection (Emerg Infect Dis. 2015 Oct 14; doi: ).

“Large-scale construction, including solar farm construction, might involve substantial soil disturbance for months, and many employees, particularly from non–Coccidioides-endemic areas, probably lack immunity to Coccidioides,” wrote Jason A. Wilken, Ph.D., of the Centers for Disease Control and Prevention, and his coauthors.

“Medical providers should consider work-related coccidioidomycosis when evaluating construction workers with prolonged febrile respiratory illness, particularly after work in Central or Southern California or in Arizona, and medical providers should follow all statutory requirements for documenting and reporting occupational illness,” Dr. Wilken concluded.

The study was supported by the Centers for Disease Control and Prevention. No conflicts of interest were declared.

VANCOUVER – Fungal foot infections in diabetic patients are often ignored and are far more than a cosmetic problem.

In patients with diabetes, tinea pedis and onychomycosis triple the likelihood of secondary bacterial infections including gram-negative intertrigo, cellulitis, and osteomyelitis. Further, they boost up to fivefold the risk of life- and limb-threatening gangrene, Dr. Manuela Papini said at the World Congress of Dermatology.

Courtesy CDC/Dr. Libero Ajello

Her own work (G Ital Dermatol Venereol. 2013 Dec;148(6):603-8), as well as that of others, indicates tinea pedis and onychomycosis in diabetic patients often goes undiagnosed, ignored, or inadequately treated.

In her own experience, four out of five diabetic patients with a fungal foot infection are unaware of it, she said. Moreover, half of those with a diagnosed fungal foot infection remain untreated or insufficiently treated, added Dr. Papini, a dermatologist at the University of Perugia (Italy).

Fungal infections of the foot are three times more common among diabetic individuals than the general population. The reasons for this disparity included impaired peripheral circulation, an immunocompromised state, autonomic neuropathy, and the inability to maintain good foot hygiene because of obesity, impaired vision, or advanced age.

The causative organisms of fungal infections in diabetic patients are the same as those seen in the general population. So are the recommended first-line treatments. But treatment response is generally poor – much worse than in nondiabetics. Adherence to antifungal medication also is a real problem in diabetic patients, due in large part to the high prevalence of comorbid conditions and resultant polypharmacy.

“Most diabetic patients say their large pill burden is an issue, and they think onychomycosis is the least important of their problems,” she explained.

Photodynamic therapy and laser treatments show promise, but the supporting data aren’t yet sufficient to warrant their introduction into clinical practice, according to Dr. Papini.

As for contemporary therapy, she noted that the British Association of Dermatologists, in its current onychomycosis treatment guidelines, reserves its A-strength recommendations for two oral drugs given daily for 12 weeks: terbinafine and itraconazole, although itraconazole can alternatively be used as pulse therapy for 3-6 months. Topical therapies are advised only for superficial white onychomycosis and early distal lateral subungual onychomycosis (Br J Dermatol. 2014 Nov;171(5):937-58).

A systematic review of the published literature on treatment of diabetic fungal foot infections concluded that there is good evidence that oral terbinafine is as safe and effective as itraconazole for treating onychomycosis. The authors, however, found that there is no evidence to guide treatment of tinea pedis in the diabetic population (J Foot Ankle Res. 2011 Dec 4;4:26).

In the nondiabetic population, the first-line treatment for tinea pedis is typically a topical antifungal. A good option in diabetic patients is luliconazole (Luzu), which is active against Trichophyton rubrum – the most common causative organism – and has the advantage of simplicity: the regimen is once-daily treatment for 2 weeks, much shorter than for many other topical antifungals, Dr. Papini observed.

Until new and better treatments come along, she continued, the key to preventing relapse of fungal foot infections in diabetic patients is to choose the simplest and most effective therapy, stress to patients the importance of completing the treatment course, and provide instruction in self-inspection and disinfection of shoes and socks.

Dr. Papini reported having no financial conflicts of interest.

bjancin@frontlinemedcom.com

VANCOUVER – Fungal foot infections in diabetic patients are often ignored and are far more than a cosmetic problem.

In patients with diabetes, tinea pedis and onychomycosis triple the likelihood of secondary bacterial infections including gram-negative intertrigo, cellulitis, and osteomyelitis. Further, they boost up to fivefold the risk of life- and limb-threatening gangrene, Dr. Manuela Papini said at the World Congress of Dermatology.

Courtesy CDC/Dr. Libero Ajello

Her own work (G Ital Dermatol Venereol. 2013 Dec;148(6):603-8), as well as that of others, indicates tinea pedis and onychomycosis in diabetic patients often goes undiagnosed, ignored, or inadequately treated.

In her own experience, four out of five diabetic patients with a fungal foot infection are unaware of it, she said. Moreover, half of those with a diagnosed fungal foot infection remain untreated or insufficiently treated, added Dr. Papini, a dermatologist at the University of Perugia (Italy).

Fungal infections of the foot are three times more common among diabetic individuals than the general population. The reasons for this disparity included impaired peripheral circulation, an immunocompromised state, autonomic neuropathy, and the inability to maintain good foot hygiene because of obesity, impaired vision, or advanced age.

The causative organisms of fungal infections in diabetic patients are the same as those seen in the general population. So are the recommended first-line treatments. But treatment response is generally poor – much worse than in nondiabetics. Adherence to antifungal medication also is a real problem in diabetic patients, due in large part to the high prevalence of comorbid conditions and resultant polypharmacy.

“Most diabetic patients say their large pill burden is an issue, and they think onychomycosis is the least important of their problems,” she explained.

Photodynamic therapy and laser treatments show promise, but the supporting data aren’t yet sufficient to warrant their introduction into clinical practice, according to Dr. Papini.

As for contemporary therapy, she noted that the British Association of Dermatologists, in its current onychomycosis treatment guidelines, reserves its A-strength recommendations for two oral drugs given daily for 12 weeks: terbinafine and itraconazole, although itraconazole can alternatively be used as pulse therapy for 3-6 months. Topical therapies are advised only for superficial white onychomycosis and early distal lateral subungual onychomycosis (Br J Dermatol. 2014 Nov;171(5):937-58).

A systematic review of the published literature on treatment of diabetic fungal foot infections concluded that there is good evidence that oral terbinafine is as safe and effective as itraconazole for treating onychomycosis. The authors, however, found that there is no evidence to guide treatment of tinea pedis in the diabetic population (J Foot Ankle Res. 2011 Dec 4;4:26).

In the nondiabetic population, the first-line treatment for tinea pedis is typically a topical antifungal. A good option in diabetic patients is luliconazole (Luzu), which is active against Trichophyton rubrum – the most common causative organism – and has the advantage of simplicity: the regimen is once-daily treatment for 2 weeks, much shorter than for many other topical antifungals, Dr. Papini observed.

Until new and better treatments come along, she continued, the key to preventing relapse of fungal foot infections in diabetic patients is to choose the simplest and most effective therapy, stress to patients the importance of completing the treatment course, and provide instruction in self-inspection and disinfection of shoes and socks.

Dr. Papini reported having no financial conflicts of interest.

bjancin@frontlinemedcom.com

VANCOUVER – Fungal foot infections in diabetic patients are often ignored and are far more than a cosmetic problem.

In patients with diabetes, tinea pedis and onychomycosis triple the likelihood of secondary bacterial infections including gram-negative intertrigo, cellulitis, and osteomyelitis. Further, they boost up to fivefold the risk of life- and limb-threatening gangrene, Dr. Manuela Papini said at the World Congress of Dermatology.

Courtesy CDC/Dr. Libero Ajello

Her own work (G Ital Dermatol Venereol. 2013 Dec;148(6):603-8), as well as that of others, indicates tinea pedis and onychomycosis in diabetic patients often goes undiagnosed, ignored, or inadequately treated.

In her own experience, four out of five diabetic patients with a fungal foot infection are unaware of it, she said. Moreover, half of those with a diagnosed fungal foot infection remain untreated or insufficiently treated, added Dr. Papini, a dermatologist at the University of Perugia (Italy).

Fungal infections of the foot are three times more common among diabetic individuals than the general population. The reasons for this disparity included impaired peripheral circulation, an immunocompromised state, autonomic neuropathy, and the inability to maintain good foot hygiene because of obesity, impaired vision, or advanced age.

The causative organisms of fungal infections in diabetic patients are the same as those seen in the general population. So are the recommended first-line treatments. But treatment response is generally poor – much worse than in nondiabetics. Adherence to antifungal medication also is a real problem in diabetic patients, due in large part to the high prevalence of comorbid conditions and resultant polypharmacy.

“Most diabetic patients say their large pill burden is an issue, and they think onychomycosis is the least important of their problems,” she explained.

Photodynamic therapy and laser treatments show promise, but the supporting data aren’t yet sufficient to warrant their introduction into clinical practice, according to Dr. Papini.

As for contemporary therapy, she noted that the British Association of Dermatologists, in its current onychomycosis treatment guidelines, reserves its A-strength recommendations for two oral drugs given daily for 12 weeks: terbinafine and itraconazole, although itraconazole can alternatively be used as pulse therapy for 3-6 months. Topical therapies are advised only for superficial white onychomycosis and early distal lateral subungual onychomycosis (Br J Dermatol. 2014 Nov;171(5):937-58).

A systematic review of the published literature on treatment of diabetic fungal foot infections concluded that there is good evidence that oral terbinafine is as safe and effective as itraconazole for treating onychomycosis. The authors, however, found that there is no evidence to guide treatment of tinea pedis in the diabetic population (J Foot Ankle Res. 2011 Dec 4;4:26).

In the nondiabetic population, the first-line treatment for tinea pedis is typically a topical antifungal. A good option in diabetic patients is luliconazole (Luzu), which is active against Trichophyton rubrum – the most common causative organism – and has the advantage of simplicity: the regimen is once-daily treatment for 2 weeks, much shorter than for many other topical antifungals, Dr. Papini observed.

Until new and better treatments come along, she continued, the key to preventing relapse of fungal foot infections in diabetic patients is to choose the simplest and most effective therapy, stress to patients the importance of completing the treatment course, and provide instruction in self-inspection and disinfection of shoes and socks.

Dr. Papini reported having no financial conflicts of interest.

bjancin@frontlinemedcom.com

MIAMI BEACH – Two new antifungal agents on the market – luliconazole and naftifine – each have something unique to offer when it comes to treating tinea pedis, according to Dr. Boni E. Elewski.

Luliconazole is an azole drug, meaning it is broad spectrum and kills dermatophytes, yeast, and molds. Also, like all azoles, it has some antibacterial activity, she said at the South Beach Symposium.

Naftifine is an allylamine drug, and is mainly an antidermatophyte agent – albeit a “very, very potent antidermatophyte” – with no antibacterial activity, she said.

Both are approved for once-daily use for 2 weeks, and that’s good because the short treatment duration improves adherence to the regimen, especially compared with other drugs that require 4-6 weeks of treatment to eradicate the problem, noted Dr. Elewski, professor of dermatology and director of clinical trials research at the University of Alabama at Birmingham.

Both drugs also stay in the skin and continue working after treatment stops.

Making the choice regarding which drug or class of drugs to use depends on the patient’s symptoms.

“First of all, tinea pedis may not be obvious. People don’t often tell you, ‘This is what I have – it’s tinea pedis,’ ” she said.

Keep in mind that tinea pedis and onychomycosis are related. If you have a patient who you think has onychomycosis, look at the bottom of their foot, she advised.

“If they don’t have tinea pedis, they probably don’t have onychomycosis unless they’ve had tinea pedis recently and got rid of it,” she said.

Also, look for collarettes of scale, which may be very subtle and may look like “tiny little circular pieces of scale on the medial or lateral foot.”

“If you are not sure, just keep looking harder because you might see it,” Dr. Elewski said.

Interdigital tinea pedis will be a little more obvious, with scaling and crusting between the toes, as well as maceration and oozing in many cases.

When the toe web is oozing, you’re likely dealing with intertrigo, she said.

In such cases, an azole cream is the better treatment choice, because azoles will kill Candida, bacteria, and dermatophytes that are there, she said.

“So when I have a moist macerated space, I like an azole. If you have a dry scaly process – with or without the collarettes – you’re probably better with an allylamine, particularly if you use a keratolytic with it, something that has urea or a lactic acid,” she said.

Dr. Elewski is a consultant for Valeant Pharmaceuticals International and a contracted researcher for Anacor Pharmaceuticals.

MIAMI BEACH – Two new antifungal agents on the market – luliconazole and naftifine – each have something unique to offer when it comes to treating tinea pedis, according to Dr. Boni E. Elewski.

Luliconazole is an azole drug, meaning it is broad spectrum and kills dermatophytes, yeast, and molds. Also, like all azoles, it has some antibacterial activity, she said at the South Beach Symposium.

Naftifine is an allylamine drug, and is mainly an antidermatophyte agent – albeit a “very, very potent antidermatophyte” – with no antibacterial activity, she said.

Both are approved for once-daily use for 2 weeks, and that’s good because the short treatment duration improves adherence to the regimen, especially compared with other drugs that require 4-6 weeks of treatment to eradicate the problem, noted Dr. Elewski, professor of dermatology and director of clinical trials research at the University of Alabama at Birmingham.

Both drugs also stay in the skin and continue working after treatment stops.

Making the choice regarding which drug or class of drugs to use depends on the patient’s symptoms.

“First of all, tinea pedis may not be obvious. People don’t often tell you, ‘This is what I have – it’s tinea pedis,’ ” she said.

Keep in mind that tinea pedis and onychomycosis are related. If you have a patient who you think has onychomycosis, look at the bottom of their foot, she advised.

“If they don’t have tinea pedis, they probably don’t have onychomycosis unless they’ve had tinea pedis recently and got rid of it,” she said.

Also, look for collarettes of scale, which may be very subtle and may look like “tiny little circular pieces of scale on the medial or lateral foot.”

“If you are not sure, just keep looking harder because you might see it,” Dr. Elewski said.

Interdigital tinea pedis will be a little more obvious, with scaling and crusting between the toes, as well as maceration and oozing in many cases.

When the toe web is oozing, you’re likely dealing with intertrigo, she said.

In such cases, an azole cream is the better treatment choice, because azoles will kill Candida, bacteria, and dermatophytes that are there, she said.

“So when I have a moist macerated space, I like an azole. If you have a dry scaly process – with or without the collarettes – you’re probably better with an allylamine, particularly if you use a keratolytic with it, something that has urea or a lactic acid,” she said.

Dr. Elewski is a consultant for Valeant Pharmaceuticals International and a contracted researcher for Anacor Pharmaceuticals.

MIAMI BEACH – Two new antifungal agents on the market – luliconazole and naftifine – each have something unique to offer when it comes to treating tinea pedis, according to Dr. Boni E. Elewski.

Luliconazole is an azole drug, meaning it is broad spectrum and kills dermatophytes, yeast, and molds. Also, like all azoles, it has some antibacterial activity, she said at the South Beach Symposium.

Naftifine is an allylamine drug, and is mainly an antidermatophyte agent – albeit a “very, very potent antidermatophyte” – with no antibacterial activity, she said.

Both are approved for once-daily use for 2 weeks, and that’s good because the short treatment duration improves adherence to the regimen, especially compared with other drugs that require 4-6 weeks of treatment to eradicate the problem, noted Dr. Elewski, professor of dermatology and director of clinical trials research at the University of Alabama at Birmingham.

Both drugs also stay in the skin and continue working after treatment stops.

Making the choice regarding which drug or class of drugs to use depends on the patient’s symptoms.

“First of all, tinea pedis may not be obvious. People don’t often tell you, ‘This is what I have – it’s tinea pedis,’ ” she said.

Keep in mind that tinea pedis and onychomycosis are related. If you have a patient who you think has onychomycosis, look at the bottom of their foot, she advised.

“If they don’t have tinea pedis, they probably don’t have onychomycosis unless they’ve had tinea pedis recently and got rid of it,” she said.

Also, look for collarettes of scale, which may be very subtle and may look like “tiny little circular pieces of scale on the medial or lateral foot.”

“If you are not sure, just keep looking harder because you might see it,” Dr. Elewski said.

Interdigital tinea pedis will be a little more obvious, with scaling and crusting between the toes, as well as maceration and oozing in many cases.

When the toe web is oozing, you’re likely dealing with intertrigo, she said.

In such cases, an azole cream is the better treatment choice, because azoles will kill Candida, bacteria, and dermatophytes that are there, she said.

“So when I have a moist macerated space, I like an azole. If you have a dry scaly process – with or without the collarettes – you’re probably better with an allylamine, particularly if you use a keratolytic with it, something that has urea or a lactic acid,” she said.

Dr. Elewski is a consultant for Valeant Pharmaceuticals International and a contracted researcher for Anacor Pharmaceuticals.

Although DNA strain type switches are known to be a natural occurrence in patients with onychomycosis, increases in strain type switching that follow treatment failure could be an antifungal-induced response, according to the results of a study published in the British Journal of Dermatology.

“The dermatophyte Trichophyton rubrum is responsible for the majority (~80%) of [onychomycosis] cases, many of which frequently relapse after successful antifungal treatment,” noted the study authors, led by Dr. Aditya K. Gupta of the University of Toronto. Despite several previous studies of various facets related to onychomycosis, “data outlining onychomycosis infections of T. rubrum with DNA strain type, treatments, outcome and geographical location are still warranted,” they added (Br. J. Dermatol. 2015;172:74-80).

© Metin Cengiz Bar??/Thinkstock

Dr. Gupta and his associates examined 50 adults infected with T. rubrum, determined via analysis of toenail specimens from onychomycosis patients in southwest Ontario. The patients were divided into cohorts based on the treatment they received: oral terbinafine, laser, or placebo (no terbinafine and no laser). Typing of DNA strains was done only in culture-positive samples before and after treatment, leaving a study population of six in the terbinafine group, nine in the laser group, and eight in the placebo group.

Half of the terbinafine subjects were prescribed oral terbinafine 250 mg/day for 12 weeks, while the other three received oral terbinafine 250 mg/day pulse therapy at on/off intervals of 2 weeks up to 12 weeks.

The investigators also used three DNA strains known to be common in Europe for comparison and found that six distinct strains, labeled A-F, accounted for 94% of the T. rubrum strains – these strains corresponded to the European ones. However, three other strains (6% of strains) were found that investigators concluded were native to North America.

Strain type switching occurred in five (83%) of the terbinafine subjects, five (56%) of the laser cohort subjects, and two (25%) of those in the placebo cohort. Roughly half of the type switches noted in the terbinafine cohort were associated with mycological cures and were followed by relapse shortly thereafter. Dr. Gupta and his associates also found that all DNA strains in this cohort were susceptible to terbinafine while in vitro. Strain types in the laser and placebo cohorts did not show any signs of intermittent cures.

The patients were sampled at intervals of 0, 12, 24, 36, 48, 60, and 72 weeks of treatment, and T. rubrum DNA strain types were determined at week 0 (n = 6) and week 48 (n = 1) or 72 (n = 5). Patients in the laser cohort were treated at weeks 0, 8, and 16 and sampled at weeks 0, 8, 16, 24, and 48, with T. rubrum DNA strain types determined at week 0 (n = 9) and week 24 (n = 5) or 48 (n = 4). Finally, placebo patients were sampled at the same regularity as those in the laser cohort, with T. rubrum DNA strain types determined at week 0 (n = 8) and week 24 (n = 1) or 48 (n = 7), they reported.

“The T. rubrum DNA strain type switches observed in ongoing infections among all treatment groups could be attributed to microevolution or coinfections of DNA strains,” the researchers noted. “The presence of coinfecting T. rubrum DNA strains that flux with environmental conditions or local niches could account for the DNA strain type switches observed in all treatment groups, where only the relatively stable types are able to propagate in culture,” they added.

Dr. Gupta and his associates did not disclose any source of funding or any relevant conflicts of interest.

dchitnis@frontlinemedcom.com

Although DNA strain type switches are known to be a natural occurrence in patients with onychomycosis, increases in strain type switching that follow treatment failure could be an antifungal-induced response, according to the results of a study published in the British Journal of Dermatology.

“The dermatophyte Trichophyton rubrum is responsible for the majority (~80%) of [onychomycosis] cases, many of which frequently relapse after successful antifungal treatment,” noted the study authors, led by Dr. Aditya K. Gupta of the University of Toronto. Despite several previous studies of various facets related to onychomycosis, “data outlining onychomycosis infections of T. rubrum with DNA strain type, treatments, outcome and geographical location are still warranted,” they added (Br. J. Dermatol. 2015;172:74-80).

© Metin Cengiz Bar??/Thinkstock

Dr. Gupta and his associates examined 50 adults infected with T. rubrum, determined via analysis of toenail specimens from onychomycosis patients in southwest Ontario. The patients were divided into cohorts based on the treatment they received: oral terbinafine, laser, or placebo (no terbinafine and no laser). Typing of DNA strains was done only in culture-positive samples before and after treatment, leaving a study population of six in the terbinafine group, nine in the laser group, and eight in the placebo group.

Half of the terbinafine subjects were prescribed oral terbinafine 250 mg/day for 12 weeks, while the other three received oral terbinafine 250 mg/day pulse therapy at on/off intervals of 2 weeks up to 12 weeks.

The investigators also used three DNA strains known to be common in Europe for comparison and found that six distinct strains, labeled A-F, accounted for 94% of the T. rubrum strains – these strains corresponded to the European ones. However, three other strains (6% of strains) were found that investigators concluded were native to North America.

Strain type switching occurred in five (83%) of the terbinafine subjects, five (56%) of the laser cohort subjects, and two (25%) of those in the placebo cohort. Roughly half of the type switches noted in the terbinafine cohort were associated with mycological cures and were followed by relapse shortly thereafter. Dr. Gupta and his associates also found that all DNA strains in this cohort were susceptible to terbinafine while in vitro. Strain types in the laser and placebo cohorts did not show any signs of intermittent cures.

The patients were sampled at intervals of 0, 12, 24, 36, 48, 60, and 72 weeks of treatment, and T. rubrum DNA strain types were determined at week 0 (n = 6) and week 48 (n = 1) or 72 (n = 5). Patients in the laser cohort were treated at weeks 0, 8, and 16 and sampled at weeks 0, 8, 16, 24, and 48, with T. rubrum DNA strain types determined at week 0 (n = 9) and week 24 (n = 5) or 48 (n = 4). Finally, placebo patients were sampled at the same regularity as those in the laser cohort, with T. rubrum DNA strain types determined at week 0 (n = 8) and week 24 (n = 1) or 48 (n = 7), they reported.

“The T. rubrum DNA strain type switches observed in ongoing infections among all treatment groups could be attributed to microevolution or coinfections of DNA strains,” the researchers noted. “The presence of coinfecting T. rubrum DNA strains that flux with environmental conditions or local niches could account for the DNA strain type switches observed in all treatment groups, where only the relatively stable types are able to propagate in culture,” they added.

Dr. Gupta and his associates did not disclose any source of funding or any relevant conflicts of interest.

dchitnis@frontlinemedcom.com

Although DNA strain type switches are known to be a natural occurrence in patients with onychomycosis, increases in strain type switching that follow treatment failure could be an antifungal-induced response, according to the results of a study published in the British Journal of Dermatology.

“The dermatophyte Trichophyton rubrum is responsible for the majority (~80%) of [onychomycosis] cases, many of which frequently relapse after successful antifungal treatment,” noted the study authors, led by Dr. Aditya K. Gupta of the University of Toronto. Despite several previous studies of various facets related to onychomycosis, “data outlining onychomycosis infections of T. rubrum with DNA strain type, treatments, outcome and geographical location are still warranted,” they added (Br. J. Dermatol. 2015;172:74-80).

© Metin Cengiz Bar??/Thinkstock

Dr. Gupta and his associates examined 50 adults infected with T. rubrum, determined via analysis of toenail specimens from onychomycosis patients in southwest Ontario. The patients were divided into cohorts based on the treatment they received: oral terbinafine, laser, or placebo (no terbinafine and no laser). Typing of DNA strains was done only in culture-positive samples before and after treatment, leaving a study population of six in the terbinafine group, nine in the laser group, and eight in the placebo group.

Half of the terbinafine subjects were prescribed oral terbinafine 250 mg/day for 12 weeks, while the other three received oral terbinafine 250 mg/day pulse therapy at on/off intervals of 2 weeks up to 12 weeks.

The investigators also used three DNA strains known to be common in Europe for comparison and found that six distinct strains, labeled A-F, accounted for 94% of the T. rubrum strains – these strains corresponded to the European ones. However, three other strains (6% of strains) were found that investigators concluded were native to North America.

Strain type switching occurred in five (83%) of the terbinafine subjects, five (56%) of the laser cohort subjects, and two (25%) of those in the placebo cohort. Roughly half of the type switches noted in the terbinafine cohort were associated with mycological cures and were followed by relapse shortly thereafter. Dr. Gupta and his associates also found that all DNA strains in this cohort were susceptible to terbinafine while in vitro. Strain types in the laser and placebo cohorts did not show any signs of intermittent cures.

The patients were sampled at intervals of 0, 12, 24, 36, 48, 60, and 72 weeks of treatment, and T. rubrum DNA strain types were determined at week 0 (n = 6) and week 48 (n = 1) or 72 (n = 5). Patients in the laser cohort were treated at weeks 0, 8, and 16 and sampled at weeks 0, 8, 16, 24, and 48, with T. rubrum DNA strain types determined at week 0 (n = 9) and week 24 (n = 5) or 48 (n = 4). Finally, placebo patients were sampled at the same regularity as those in the laser cohort, with T. rubrum DNA strain types determined at week 0 (n = 8) and week 24 (n = 1) or 48 (n = 7), they reported.

“The T. rubrum DNA strain type switches observed in ongoing infections among all treatment groups could be attributed to microevolution or coinfections of DNA strains,” the researchers noted. “The presence of coinfecting T. rubrum DNA strains that flux with environmental conditions or local niches could account for the DNA strain type switches observed in all treatment groups, where only the relatively stable types are able to propagate in culture,” they added.

Dr. Gupta and his associates did not disclose any source of funding or any relevant conflicts of interest.

dchitnis@frontlinemedcom.com