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List of contributors N.F. Lightfoot Public Health Laboratory Service, Newcastle upon Tyne, U.K. E.A. Maier European Commission, DG XII Measurement and Testing Programme, Brussels, Belgium H. Beckers Unilever Research Laboratory, Vlaardingen, Netherlands S. Dahms Institut fur Biometrie der freien Universitdt Berlin, Berlin, Germany J.M. Delattre Institut Pasteur de Lille, Lille, France A. Havelaar National Research Institute of Public Health & Environmental Protection (RFVM), Bilthoven, Netherlands M. Michels Unilever Research Laboratory, Vlaardingen, Netherlands S. Niemela University of Helsinki, Helsinki, Finland J. Papadakis Athens School of Hygiene, Athens, Greece D. Roberts Food Hygiene Reference Laboratory, Central Public Health Laboratory, London, U.K. H. Tillett Communicable Disease Surveillance Centre, Public Health Laboratory Service Board, London, U.K. H.R. Veenendaal KIWA NV, Nieuwegein, Netherlands H. Weiss Institut fur Biometrie der freien Universitdt Berlin, Berlin, Germany