Sources of Infection in Undulant Fever

Abstract

1. Samples of milk from 183 cows were examined, and seventeen (9·2 per cent.) yielded Br. abortus.2. Two hundred and two samples of butter, margarine, cheese, and icecream failed to yield Br. abortus, although samples of locally prepared butter and cheese both contained tubercle bacilli.3. Examination of the serum from slaughtermen and men working in allied trades showed some evidence of latent infection, but no indication of much real illness due to Br. abortus.4. Examination of the sera of sheep failed to show any evidence that these animals become infected with Br. abortus.5. The examination of sera and organs from pigs failed to show any evidence that the porcine type of Br. abortus occurs.