Distribution of Aeromonas species in waters with different levels of pollution

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Abstract
Strains of Aeromonas spp. (883) were isolated from 10 stations in the north-west of Spain. Biotyping of the strains gave: 55% Aeromonas caviae, 34% A. hydrophila, 6% A. sobria and 5% Aeromonas spp. Phenotypic characters that have been claimed to be related to virulence such as haemolysis and the Voges-Proskauer reaction were detected mostly in A. hydrophila and A. sobria. The distribution of the species was significantly related to levels of faecal pollution in waters. Aeromonas caviae predominated in sewage and waters with a high degree of faecal pollution. In less polluted waters, either fresh or marine, A. caviae and A. hydrophila were almost equally distributed. In waters with low or no faecal pollution, the proportion of A. sobria to other species increased considerably.

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