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Original Article
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Volume 312:404-407 February 14, 1985 Number 7
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Pasteurized Milk as a Vehicle of Infection in an Outbreak of Listeriosis
David W. Fleming, M.D., Stephen L. Cochi, M.D., Kristine L. MacDonald, M.D., Jack Brondum, D.V.M., M.S., Peggy S. Hayes, B.S., Brian D. Plikaytis, M.S., Marion B. Holmes, B.S., A. Audurier, Ph.D., Claire V. Broome, M.D., and Arthur L. Reingold, M.D.

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 by Barza, M.

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ABSTRACT

Background and Methods Between June 30th and August 30th, 1983, 49 patients in Massachusetts acquired listeriosis. Seven cases occurred in fetuses or infants and 42 in immunosuppressed adults; 14 patients (29 per cent) died. Of 40 Listeria monocytogenes isolates available for testing, 32 were serotype 4b. Two case–control studies, one matching for neighborhood of residence and the other for underlying disease, revealed that the illness was strongly associated with drinking a specific brand of pasteurized whole or 2 per cent milk (odds ratio = 9, P<0.01 for the neighborhood-matched study; odds ratio = 11.5, P<0.001 for the illness-matched study).

Results The association with milk was further substantiated by four additional analyses that suggested the presence of a dose–response effect, demonstrated a protective effect of skim milk, associated cases with the same product in an independent study in another state, and linked a specific phage type with the disease associated with milk. The milk associated with disease came from a group of farms on which listeriosis in dairy cows was known to have occurred at the time of the outbreak. Multiple serotypes of L. monocytogenes were isolated from raw milk obtained from these farms after the outbreak. At the plant where the milk was processed, inspections revealed no evidence of improper pasteurization.

Conclusions These results support the hypothesis that human listeriosis can be a foodborne disease and raise questions about the ability of pasteurization to eradicate a large inoculum of L. monocytogenes from contaminated raw milk.


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From the Respiratory and Special Pathogens Epidemiology Branch, the Enteric Diseases Branch, the Respiratory and Special Pathogens Laboratory Branch, and the Statistical Services Branch, Division of Bacterial Diseases, Center for Infectious Diseases, Centers for Disease Control, Atlanta; the Division of Epidemiology, Vermont Department of Health, Burlington; the State Laboratory Institute, Massachusetts Department of Public Health, Boston; and the Laboratoire de Microbiology, Faculte de Medicine, 37032 Tours, France. Address reprint requests to Dr. Fleming at the Respiratory and Special Pathogens Epidemiology Branch, Bldg. 1, Rm. 5405, Centers for Disease Control, Atlanta, GA 30333.

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