Abstract
Drinking water from three different municipal distribution systems in Sweden was investigated for the occurrence of Aeromonas spp. and identification of virulence factors of these organisms. Twenty-three of the 27 samples (85%) from the three distribution systems were positive for presumptive Aeromonas with a maximum of 860 cfu/100 ml drinking water. Of the 61 randomly selected presumptive Aeromonas isolates, 41 were identified as A. hydrophila and 20 as A. sobria . These Aeromonas isolates produced a variety of potential virulence factors such as haemolysin, cytotonic- and cytotoxic-toxin, enterotoxin and protease. These findings on the presence of Aeromonas in municipal drinking water supplies in Sweden show that the consumer can be exposed to high number of aeromonads. However, more epidemiological information needs to be gathered in this regard to elucidate their public health significance.
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