During the period April 1987-February 1989 the contamination of Parma river by Salmonella was studied. These pathogens were almost constantly isolated all over the period of survey (91.7% of samples were positive). The concentration of Salmonella Spp, evaluated as MPN/1, appeared to be also remarkable, ranging from 1 to 92/l. The variety of serotypes appeared furthermore considerable either regarded on the whole (38 serotypes) or related to the single drawings (from 2 to 14 serotypes simultaneously present in 90.9% of samples). Some serotypes as: S. typhimurium, S. livingstone, S. brandenburg, S. panama, have been recovered from most of samples, some others as S. give, S. Stanleyville, S. agona have been recovered only in a few times.
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