“…However, once the infection has been introduced into the flock environment, contamination of water troughs by contami nated feed, down, dust, or feces is a possibility. The results of this investigation indicate that this situation frequently occurs on the farm, Gauger and Greaves (1946c) showed that drinking water could become con Recoveries of any serotype from a particular piece of equipment in the picking, eviscerating, or packaging areas were not made on more than three consecutive days. After this period, these bacteria were removed by effective cleaning, diluted sufficiently so as to be undetected, or replaced by other serotypes.…”