Epidemiology and Infection



The role of outbreaks in developing food safety policy: population based surveillance of salmonella outbreaks in Wales 1986–98


S. PALMER a1a2c1, S. PARRY a1, D. PERRY a2, R. SMITH a2, M. EVANS a1a2, L. NEHAUL a3, R. ROBERTS a4, M. WALAPU a5 and D. WRIGHT a6
a1 University of Wales College of Medicine, Heath Park, Cardiff CF4 4XN
a2 PHLS Communicable Disease Surveillance Centre (Welsh Unit), Abton House, Wedal Road, Roath, Cardiff CF4 3QX
a3 Gwent Health Authority, Mamhilad House, Mamhilad Park Estate, Pontypool, Gwent
a4 North Wales Health Authority, Preswylfa, Hendy Road, Mold, Flintshire
a5 Dyfed/Powys Health Authority, PO Box 13, Carmarthen SA31 3YH
a6 Morgannwg Health Authority, 41 High Street, Swansea, West Glamorgan

Abstract

In developing public policy on food safety, systematic identification and thorough investigation of all general outbreaks is necessary in order to avoid bias towards highly publicised outbreaks. In Wales, from 1986 to 1998, 87 general foodborne outbreaks of salmonellosis were identified. Most outbreaks occurred at functions or were associated with small catering outlets such as bakeries and sandwich bars. In 50 outbreaks, a vehicle of infection was confirmed microbiologically and/or epidemiologically. The most common food vehicles were those containing shell eggs. Salmonella enteritidis outbreaks were significantly more likely than outbreaks of other serotypes to be associated with vehicles containing shell eggs, suggesting that eggs were also the source of infection in many outbreaks. The routine use of analytical epidemiological studies to identify vehicles in outbreaks is recommended.

(Accepted July 12 2000)


Correspondence:
c1 Author for correspondence: PHLS Communicable Disease Surveillance Centre (Welsh Unit), Abton House, Wedal Road, Roath, Cardiff CF4 3QX.


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