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Year : 2010  |  Volume : 53  |  Issue : 4  |  Page : 896-897
Rare isolation of Trichophyton soudanense from three cases of superficial mycoses in Lucknow, India

1 Department of Microbiology, Era's Lucknow Medical College, Sarfarazganj, Hardoi Road, Lucknow, India
2 Department of Dermatology and Venereology, Era's Lucknow Medical College, Sarfarazganj, Hardoi Road, Lucknow, India

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Date of Web Publication27-Oct-2010

How to cite this article:
Sahai S, Mishra D, Tripathi P. Rare isolation of Trichophyton soudanense from three cases of superficial mycoses in Lucknow, India. Indian J Pathol Microbiol 2010;53:896-7

How to cite this URL:
Sahai S, Mishra D, Tripathi P. Rare isolation of Trichophyton soudanense from three cases of superficial mycoses in Lucknow, India. Indian J Pathol Microbiol [serial online] 2010 [cited 2021 Aug 5];53:896-7. Available from: https://www.ijpmonline.org/text.asp?2010/53/4/896/72051


Dematophytoses are infections of the skin, hair and nails, caused by dermatophytes, namely Trichophyton sps, Microsporum sps and Epidermophyton floccosum. Dermatophytes are zoophilic, anthropophilic and geophilic organisms based on the ecological conditions. Dermatophytes have a worldwide distribution, but few species are endemic in specific areas of the world. [1] Trichophyton soudanense is an anthropophilic dermatophyte endemic to the sub-Saharan Africa region. Outside Africa, sporadic cases have been reported from the USA, Europe, Brazil and New Zealand, in which the majority of the cases were African immigrants. [2] Patwardhan and Dave [3] isolated T. soudanense from cases of tinea corporis and tinea cruris each from south India about a decade back and this is the first report from Uttar Pradesh, India.

We isolated T. soudanense from a 6-year-old girl suffering from tinea capitis, a 46-year-old male suffering from tinea unguium and a 30-year-old male diagnosed as a case of tinea corporis. All cases were referred from the outpatient department of Dermatology and Venereology of our institution for fungal culture. All cases had neither history of traveling abroad nor any contact with persons of African origin. Direct 10% KOH mount from the respective specimens were positive for fungal elements and culture of the specimens on Sabouraud's dextrose agar supplemented with 0.05% chloramphenicol and 0.5% cycloheximide yielded colonies of T. soudanense after 3 weeks of incubation at 25°C. Isolates were identified on the basis of colony morphology; slow growing, initially flat, with a suede-like texture, a spidery edge and a distinctive orange-yellow color [Figure 1]a. Lactophenol cotton blue mount of the slide culture exhibited short, segmented hyphae, reflexive branching and no macroconidia [Figure 1]b. On Lowenstein-Jensen medium, the isolates produced a dark brown pigment. Urease test and hair perforation test were negative. [1]
Figure 1: a: Colony morphology of Trichophyton soudanense on Sabouraud's Dextrose Agar
b: Lactophenol cotton blue (LCB) mount of Trichophyton soudanense showing the characteristic reflexive branching and segmented hyphae with no conidia (LCB, ×400)

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Epidemiology of dermatophytes keeps changing with time. T. rubrum is the most common isolate from superficial mycoses cases in India. [4] A recent study using a microsatellite marker has suggested that T. soudanense is more closely related to T. rubrum. These evolutionary relationships are interesting and might explain the unexpected isolation of T. soudanense in non-endemic regions around the world. [5]

We can conclude that in the era of economic liberalization, when people have started traveling abroad more frequently, isolation of uncommon dermatophytes can occur anywhere in the world and medical mycologists should keep themselves updated in diagnosing such isolates.

   References Top

1.Rippon JW. Medical mycology: The pathogenic fungi and the pathogenic actinomycetes. 3 rd ed. Philadelphia: W.B. Saunders; 1988.  Back to cited text no. 1
2.Magill SS, Manfredi L, Swiderski A, Cohen B, Merz WG. Isolation of Trichophyton violaceum and Trichophyton soudanense in Baltimore, Maryland. J Clin Microbiol 2007;45:461-5.  Back to cited text no. 2
3.Patwardhan N, Dave R. Dermatomycosis in and around Aurangabad. Indian J Pathol Microbiol 1999;42:455-62.  Back to cited text no. 3
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4.Das S, Goyal R, Bhattacharya SN. Laboratory based epidemiological study of superficial fungal infections. J Dermatol 2007;34:248-53.  Back to cited text no. 4
5.Ohst T, de Hoog S, Presber W, Stavrakieva V, Graser Y. Origins of microsatellite diversity in the Trichophyton rubrum-T violaceum clade (dermatophytes). J Clin Microbiol 2004;42:4444-8.  Back to cited text no. 5

Correspondence Address:
Sanjeev Sahai
S/O Mr. R. Sahai, House No.: 56, Opposite Arya Samaj Mandir, Town Hall Road, Shahjahanpur - 242 001, Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0377-4929.72051

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