Diagnosis of Tinea pedis and onychomycosis in patients from Portuguese National Institute of Health: a four-year study

Abstract

Tinea pedis and onychomycosis are two rather diverse clinical manifestations of superficial fungal infections, and their etiologic agents may be dermatophytes, non-dermatophyte moulds, or yeasts. This study was designed to statistically describe the data obtained as results of an analysis conducted during a four-year period on the frequency of Tinea pedis and onychomycosis and their etiologic agents. A questionnaire was distributed from 2006 to 2010 and answered by 186 patients, who were subjected to skin and/or nail sampling. Frequencies of the isolated fungal species were cross-linked with the data obtained with the questionnaire, seeking associations and pre-disposing factors. One hundred and sixty-three fungal isolates were obtained, 24.2% of which were composed of more than one fungal species. Most studies report the two pathologies as caused primarily by dermatophytes, followed by yeasts, and lastly by non-dermatophytic moulds. Our study does not challenge this trend. We found a frequency of 15.6% of infections caused by Dermatophytes (with a total of 42 isolates) of which T. rubrum was the most frequent species (41.4%). There was no significant association (p >0.05) between visible injury and the independent variables tested, namely age, gender, owning a pet, education, swimming pool attendance, sports activity, and clinical information. Unlike other studies, the variables considered did not show the expected influence on dermatomycosis of the lower limbs. It is hence necessary to conduct further studies to specifically identify which variables do in fact influence such infections.

Keywords

• Tinea pedis
• Onychomycosis
• Frequency
• Etiologic agents
• Variables