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Contaminated marine wounds--the risk of acquiring acute bacterial infection from marine recreational beaches.

An animal model was used to determine the potential for causing wound infections of bacteria isolated from marine recreational beaches in Hong Kong. Water samples were characterized physically, chemically and bacteriologically and used to inoculate artificially-induced wounds in rats. Morbidity and mortality correlated significantly (P < 0.01) with MacConkey plate counts and faecal coliform counts (membrane filtration) and inversely with salinity of the water. The majority of deaths were due to infection caused by marine and estuarine bacteria rather then enteric organisms. A total of 318 bacterial strains was isolated from the wounds and blood of animals inoculated with seawater, of which 242 were marine/estuarine (predominantly Vibrio spp., Aeromonas hydrophila and Pseudomonas putrefaciens) and 40 were enterobacteria. The virulence of the animal strains were comparable with those from clinical sources.