title: Escherichia coli O157:H7 in healthy dairy cows.
abstract: Faecal samples were taken from 371 cows originating from 55 dairy farms and slaughtered at one slaughterhouse; tonsils were taken from 215 of these animals. Escherichia coli 0157:H7 was found in the faeces of only two animals and was not found in any tonsils. The farm supplying the first positive cow detected at the slaughterhouse was visited 3 months later and 160 animals (80 cows and 80 heifers) were tested by rectal swabs; E. coli 0157:H7 was not isolated.
authors: Meat Industry Research Institute of New Zealand (Inc.), PO Box 617, Hamilton, New Zealand.
authors: S
authors: S
authors: Buncic
authors: S M
authors: SM
authors: Avery