Salmonella enteritidis and S. typhimurium in Western Europe for 1993-1995: a surveillance report from Salm-Net.
Surveillance has been defined as the ongoing systematic collection, collation and analysis of data and the prompt dissemination of the resulting information to those who need to know so that an action can result. This is achieved in two ways. Firstly, i
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PHLS Communicable Disease Surveillance Centre, London, England.