Control ofCryptococcus neoformansin nature by biotic factors

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Abstract
Two bacterial species (Pseudomonas aeruginosa and Bacillus subtilis) isolated from pigeon droppings, displayed anti Cryptococcus neoformans activity on 4 of 6 media and sterilized pigeon droppings. Acanthamoeba palestinensis trophozoites isolated from pigeon droppings ingested and killed 99·9% of C. neoformans cells after 7 days of incubation. Mites and sow bugs (Metoponorthus pruinosus) isolated from pigeon droppings appear to be fungivorous. These findings suggest that many organisms that occur in pigeon droppings influence C. neoformans persistence, reproduction, morphology and distribution in nature.