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Cryptococcus neoformans is an opportunistic pathogenic yeast that causes meningoencephalitis and deep skin dermatitis in humans and animals. A hygienic strategy using disinfectants on environmental samples can reduce the risk to the public. The objectives were to survey the distribution of C. neoformans in pigeon fecal droppings collected in 11 districts in Bangkok during 2011-2012 and to evaluate the efficacy of three commercial disinfectant products (based on potassium monopersulfate, sodium hypochlorite and quaternary ammonium compounds, respectively). These were evaluated against pure C. neoformans and yeasts resuspended in sterile pigeon feces using the dilution-neutralization method [Europäische NORM (EN) 1656]. In total, 18 of 164 (11%) samples were positive for C. neoformans. These came from only three of the 11 districts, with a prevalence of between 13-56%. Using multiplex PCR, serotype A was the sole group found. For all disinfectants, C. neoformans mixed in feces was tolerated at a higher dose and time exposure than pure isolates. The most effective disinfectant in this study was a 0.12% quaternary ammonium compound that could rapidly eradicate the yeasts mixed in feces. This finding highlights the occurrence and distribution of C. neoformans in the capital city of Thailand and the need to prolong the duration of exposure to disinfectants with pigeon feces.

Occurrence and susceptibilities to disinfectants of <i>Cryptococcus neoformans</i> in fecal droppings from pigeons in Bangkok, Thailand