Distribution of clinically important thermophilic actinomycetes in vegetable substrates and soil in north-western India |
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Authors: | Madhurama Gangwar Z. U. Khan H. S. Randhawa J. Lacey |
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Affiliation: | (1) Department of Medical Mycology, Vallabhbhai Patel Chest Institute, University of Delhi, P.O. Box 2101, 110 007 Delhi, India;(2) Rothamsted Experimental Station, AFRC Institute of Arable Crops Research, AL5 2JQ Harpenden, Herts, UK |
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Abstract: | Medically important thermophilic actinomycetes were isolated from 218 (64%) of 341 samples of vegetable substrates and soil examined from sites in north-western India. Thermoactinomyces vulgaris (T. candidus) was the commonest species, occurring in 56% of samples, followed by Saccharomonospora viridis in 29%, Thermoactinomyces thalpophilus in 27%, Faenia rectivirgula (Micropolyspora faeni) in 21% and Thermoactinomyces sacchari in 14%. T. vulgaris and T. thalpophilus were isolated from all types of substrate examined, with T. vulgaris always more common than T. thalpophilus. Of the other thermophilic actinomycetes, F. rectivirgula was isolated predominantly from hay (44%) and S. viridis (56%) and T. sacchari (44%) from sugarcane bagasse. The largest populations of T. vulgaris and T. thalpophilus were found in paddy straw, followed by T. sacchari, S. viridis and F. rectivirgula in sugar-cane bagasse.The widespread occurrence of these clinically important thermophilic actinomycetes suggests that exposure of humans and animals to them may be frequent in north-western India. Studies are required to determine the prevalence of extrinsic allergic alveolitis (hypersensitivity pneumonitis) caused by thermophilic actinomycetes in the local population. |
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Keywords: | thermophilic actmonycetes in India Faenia rectivirgula Thermoactinomyces spp. Saccharomonospora viridis hay compost bagasse soil straw |
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