An outbreak of Salmonella napoli infection in England and Wales in 1982 was detected by the surveillance of routine reports of salmonella infections from hospital and public-health laboratories. Epidemiological investigation quickly identified two types of small chocolate-covered bars, imported from Italy, as the vehicles of infection, and subsequently both were found to be contaminated with the organism. The prompt recognition of this outbreak and rapid identification of the vehicle of infection enabled four-fifths of the consignment of contaminated chocolate to be withdrawn from the market. The 245 reported cases resulted from the sale of 600 000 bars; as these were presumably only a small fraction of the total number of cases, it is likely that many thousands of infections were prevented.
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