Abundance ofAeromonasspp. in various components of pond ecoysystems in Dhaka, Bangladesh

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Abstract
Aeromonas spp. are considered to be waterborne agents of human gastroenteritis. A study was carried out in five ponds in Dhaka city over a period of one year to investigate the distribution and seasonality of these organisms in various components of pond ecosystems. Samples were collected from plants, water, phytoplankton and sediment every 15 days over 12 months and cultured for Aeromonas spp. using enrichment techniques. A. sobria, A. hydrophila and A. caviae were isolated from 199 (41.46%), 29 (6.04%) and 21 (4.38%) of the 480 samples, respectively. Two distinct peaks of A. sobria were observed in all components; one during the warmer months of May‐July and the other at the beginning of winter in November. Aeromonas spp. were isolated from all components from all ponds during the study period. This study gives some insight into the epidemiology of diarrhoea due to Aeromonas spp. in Bangladesh.

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