Journal Article

Seasonal variations in the prevalence of <i>Cryptococcus neoformans</i> var. <i>grubii</i> and <i>Cryptococcus gattii</i> in decayed wood inside trunk hollows of diverse tree species in north-western India: a retrospective study

H. S. Randhawa, T. Kowshik, Anuradha Chowdhary, Anupam Prakash, Z. U. Khan and Jianping Xu

in Medical Mycology

Published on behalf of International Society for Human and Animal Mycology

Volume 49, issue 3, pages 320-323
Published in print April 2011 | ISSN: 1369-3786
Published online April 2011 | e-ISSN: 1460-2709 | DOI: https://dx.doi.org/10.3109/13693786.2010.516457
Seasonal variations in the prevalence of Cryptococcus neoformans var. grubii and Cryptococcus gattii in decayed wood inside trunk hollows of diverse tree species in north-western India: a retrospective study

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This study presents a 7-year retrospective analysis of seasonal variations in the prevalence of Cryptococcus neoformans var. grubii and Cryptococcus gattii in decayed wood inside trunk hollows of 518 trees belonging to 20 species in north-western India during 2000–2007. Of the 1,439 wood samples investigated, 406 (28.2%) were found to be positive for the Cryptococcus neoformans species complex which included 247 samples from which C. neoformans var. grubii was recovered and 171 which yielded C. gattii. While both of the pathogens were isolated through all the seasons, the overall prevalence of C. neoformans var. grubii was significantly higher (17.2%) than that of C. gattii serotype B (11.9%, P < 0.0001), indicating that decayed wood was as good, if not better, a natural habitat of C. neoformans var. grubii as that of C. gattii. The highest recovery of both yeasts was in the autumn, followed by that in the summer. For C. gattii, the lowest prevalence occurred during the winter and for C. neoformans var. grubii during the rainy season. The low prevalence of C. gattii during winter is similar to that reported from Bogota, Colombia, where C. gattii had a low population density in bark samples but it was not found in decayed wood of trunk hollows investigated during the period of January and February. The prevalence of C. neoformans var. grubii was significantly lower in the rainy season than in the other portions of the year. This finding is similar to the reported low isolation frequency (4%) of C. neoformans var. grubii from chicken feces in the rainy season in northern Thailand. Further investigations are warranted to determine the clinical significance of seasonal variations in the prevalence of C. neoformans var. grubii and C. gattii in decayed trunk wood of various trees in climatically divergent regions of India.

Keywords: Cryptococcus neoformans var. grubii; Cryptococcus gattii; seasonal prevalence; decayed wood; India

Journal Article.  1903 words.  Illustrated.

Subjects: Mycology and Fungi ; Infectious Diseases ; Medical Toxicology ; Veterinary Medicine ; Environmental Science

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