A milk-borne campylobacter outbreak following an educational farm visit.
After a nursery school trip to a dairy farm, 20 (53%) of 38 children and 3 (23%) of 13 adult helpers developed gastrointestinal infection. Campylobacter jejuni was isolated from 15 primary cases and from 3 of 9 secondary household cases. A cohort study of the school party found illness to be associated with drinking raw milk (relative risk 5.4, 95% confidence interval 1.4-20.4, P = 0.001). There was a significant dose response relationship between amount of raw milk consumed and risk of illness (chi 2-test for linear trend 12.1, P = 0.0005) but not with incubation period, severity of symptoms or duration of illness. All 18 human campylobacter isolates were C. jejuni resistotype 02 and either biotype I (number 16) or biotype II (number 2). Campylobacter was also isolated from samples of dairy cattle and bird faeces obtained at the farm but these were of different resisto/biotypes. Educational farm visits have become increasingly popular in recent years and this outbreak illustrates the hazard of exposure to raw milk in this setting.
Evans
M R
MR
Department of Public Health Medicine, South Glamorgan Health Authority, Cardiff.
Roberts
R J
RJ
Ribeiro
C D
CD
Gardner
D
D
Kembrey
D
D
D000328:Adult; D000818:Animals; D002169:Campylobacter Infections / Q000453:epidemiology* / Q000503:physiopathology; D016123:Campylobacter jejuni / Q000302:isolation & purification* / Q000472:pathogenicity; D002417:Cattle / Q000382:microbiology*; D002675:Child, Preschool; D004196:Disease Outbreaks; D004812:Epidemiologic Methods; D005759:Gastroenteritis / Q000453:epidemiology* / Q000503:physiopathology; D006801:Humans; D008892:Milk / Q000382:microbiology*; D014852:Wales / Q000453:epidemiology