Indian Journal of Medical Microbiology Home 

[Download PDF]
Year : 2006  |  Volume : 24  |  Issue : 1  |  Page : 77--78

Dermatophytosis in Assam

SS Sen, ES Rasul 
 Department of Microbiology, Guwahati Medical College, Guwahati- 781 009, Assam, India

Correspondence Address:
E S Rasul
Department of Microbiology, Guwahati Medical College, Guwahati- 781 009, Assam

How to cite this article:
Sen S S, Rasul E S. Dermatophytosis in Assam.Indian J Med Microbiol 2006;24:77-78

How to cite this URL:
Sen S S, Rasul E S. Dermatophytosis in Assam. Indian J Med Microbiol [serial online] 2006 [cited 2021 Mar 8 ];24:77-78
Available from:

Full Text

Dear Editor,

The dermatophytoses constitute a group of superficial fungus infections of keratinised tissued, viz; the epidermis, hair and nails, caused by a closely related group of filamentous fungi, the dermatophytes. There are three genera of dermatophytes, Trichophyton, Microsporum and Epidermophyton .[1] Dermatophytosis is a common disease in tropical countries due to factors like heat and humidity. This part of Assam receives heavy rainfall during the monsoon months and the humidity remains high almost throughout the year. The high humidity and temperature provides a fertile ground for the abundant growth of dermatophytes. Dermatophytosis has been reported from different parts of India [2],[3],[4] but there are no reports from this part of Assam. The present study was therefore undertaken to determine the clinical pattern of dermatophytosis and species of dermatophyte prevalent here.

One hundred clinically suspected cases of dermatophytosis attending the dermatology out patient department of Guwahati Medical College Hospital, Guwahati during a one year period were studied. The age, sex, and clinical diagnosis of the patients were recorded. The most common clinical type of dermatophytosis observed in the present study was tinea corporis (48%) followed by tinea cruris (19%) and tinea unguium (11%). Infection was found to be common in adults aged 21 - 30 years (44%) and in males, the male to female ratio being 2.85: 1.

Clinical material like skin scrpings, nail clippings and infected hair were collected from the patient and processed for mycological study. Direct microscopy was done using 10% potassium hydroxide solution and culture was carried out using Sabouraud dextrose agar (SDA) medium with chloramphenicol (0.05mg/mL) and cycloheximide (0.05mg/mL). Positive cultures were identified by studying colony characteristics, pigment production and microscopic examination in lactophenol cotton blue preparation. Special test like hair perforation test, urease production or slide culture were performed whenever necessary by standard techniques. [5] Forty nine (49%) cases were positive for fungal elements by direct microscopical examination. Culture was positive in 51 (51%) cases and of these four had no evidence of fungus by direct microscopy while two out of 49 culture negative cases were positive by direct microscopy. Five species of dermatophytes were isolated [Table 1].

Trichophyton rubrum was the most common aetiological agent isolated in this study (68.63%) which is in conformity with other reports. [2],[3],[4] It was followed by Trichophyton mentagrophyte (23.53%) and Epidermophyton floccosum (3.92%). Trichophyton violaceum and Trichophyton tonsurans were isolated one each (1.96%). No case of Microsporum was detected in the present study as also reported in several other studies.[3],[4] Dermatophytosis was seen to occur more (63%) during the hot and humid months of the year.

The present study has given us a clear insight into the mycological aspect of dermatophytosis in Assam and indicated no significant difference in the distribution of various species of dermatophytes in Assam as compared to other parts of India.


1Emmons CW, Bindford CH, Utz JP, Kwon-Chung KL. Editors. Dermatophytoses, Chapter 10. In : Medical Mycology, 3rd edn. Lea & Febiger: Philadelphia; 1977. p. 117-67.
2Gujarathi UK, Sivarajan K, Khubnani H. Dermatophytosis Loni. Indian J Med Microbiol 1996: 14: 116-7.
3Mohan U, Jindal N, Devi P. Dermatophytosis in Amristsar. Indian J Med Microbiol 1997; 15: 46.
4Mohanty JC, Mohanty SK, Sahoo RC, Sahoo A, Praharaj Ch. N. Incidence of Dermatophytosis in Orissa. Indian J Med Microbiol 1998: 16: 78-80.
5Forbes BA, Sahm DF, Weissfeld AS (Editors). Laboratory Methods in Basic Mycology, Chapter 53. In : Bailey and Scott's Diagnostic Microbiology, 11th Edn. Mosby: St. Louis; 2002. p. 711-97.