Epidemiology and Infection

Research Article

An outbreak of Salmonella saint-paul infection associated with beansprouts

M. O'Mahonya1, J. Cowdena1 c1, B. Smytha1, D. Lyncha1, M. Halla2, B. Rowea2, E. L. Tearea3, R. E. Tettmara3, A. M. Ramplinga4, M. Colesa4, R. J. Gilberta5, E. Kingcotta6 and C. L. R. Bartletta1

a1 PHLS Communicable Disease Surveillance Centre

a2 PHLS Division of Enteric Pathogens

a3 PHLS Chelmsford Laboratory

a4 PHLS Cambridge Laboratory

a5 PHLS Food Hygiene Laboratory

a6 Department of Health and Social Security

Abstract

In March 1988, there was an outbreak of infection by a strain of Salmonella saint-paul with a distinctive antigenic marker. A total of 143 reports were received between 1 March and 7 June. Preliminary investigations suggested that raw beansprouts were a possible source of infection and a case-control study confirmed the association. S. saint-paul of the epidemic type was isolated from samples of beansprouts on retail sale in different cities in the United Kingdom and from mung bean seeds on the premises of the producer who was most strongly associated with cases. In addition, Salmonella virchow PT34 was isolated from samples of raw beansprouts and was subsequently associated with seven cases of infection. Four other serotypes of salmonella were also isolated from beansprouts. On 8 April the public were advised to boil beansprouts for 15 seconds before consumption, and the premises of the one producer associated with many cases were closed. As a result of these actions there was a significant decrease in the number of infections with S. saint-paul.

(Accepted October 03 1989)

Correspondence:

c1 Correspondence to: Dr J. M. Cowden, PHLS Communicable Disease Surveillance Centre, 61 Colindale Avenue, London NW9 5EQ.

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