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A model system previously developed for the rapid detection of Salmonella typhimurium in foods was improved and extended to many other Salmonella serotypes. The original protocol, which consisted of an overnight nonselective culture followed by a specific enzyme-linked immunosorbent assay (ELISA), was modified and improved. A sandwich ELISA which used polyclonal antibodies for the capture stage and a cocktail of monoclonal antibodies for the detector stage was developed. The assay recognized a wide range of Salmonella serotypes; S. enteritidis, the most important serotype in the United Kingdom had a detection limit in the ELISA of about 4 x 10(2) cells ml-1. The cultural stage prior to the ELISA was either a single nonselective broth (incubated for 28 h) or a preenrichment broth (incubated for 7 h) plus a selective broth (incubated for 21 h). Antibodies which bind to cells grown in the unfavorable conditions of a selective medium were selected. It was concluded that, in the future, the shortened protocols for the detection of Salmonella spp. in foods described here will be of considerable value.

Further studies on the feasibility of one-day Salmonella detection by enzyme-linked immunosorbent assay