An outbreak of Salmonella hadar associated with food consumption at a building site canteen |
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Authors: | Annunziata Faustini Massimo Sangalli Francesco Forastiere Carlo A. Perucci Mirella Fantasia Rosa Manganello Eva Mattaccini Maria T. Topi Rita Trippanera Ugo La Rosa Domenico Spera |
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Affiliation: | (1) Department of Epidemiology, Lazio Regional Health Authority, Italy;(2) National Public Health Institute, Italy;(3) Lazio Public Health Laboratory, Italy;(4) Lazio Local Health Unit, Rome, Italy |
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Abstract: | A biphasic outbreak of gastroenteritis caused by Salmonella hadar affected canteen employees and workers at a construction site in central Italy in September 1994. There were 448 symptomatic cases, from 61 of whom group C Salmonella was isolated. Six cases were canteen employees. Twenty-two other individuals were asymptomatic excreters. There were 10 secondary cases. Working as a food handler at the canteen constituted an increased risk of infection, independently of ingestion of the food (odds ratio: 62.1; 95% confidence interval (CI): 9.5– 406.6). Having eaten at the canteen on the 19th and 20th September was identified as risk factor for subjects symptomatic within 72 hours (relative risk (RR): 17.0, 95% CI: 2.3–124.3), and cooled meat salad was identified as the vehicle of infection (RR: 36.6, 95% CI: 14.3–93.8). The use of portable toilets was another possible route of transmission of infection for all cases (RR: 1.3, 95% CI: 1.0–1.6). The index case was a cook who had symptoms five days before the peak of the outbreak. From 27 individuals both symptomatic and asymptomatic excreters group B, group D and not-typed Salmonellas were isolated. This study underlines the problem of improper food handling in salmonellosis outbreaks and emphasizes the role of several vehicles in the transmission of salmonellosis in a community. |
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Keywords: | Disease outbreaks Food handling Foodborne infections Gastroenteritis Salmonella Salmonella hadar |
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