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Horizontal transmission of Salmonella enteritidis and the effect of airflow on spreading were examined in 80 5-wk-old chickens divided into five groups. Sixteen chickens in each group were placed in four cages in a row separated by wire. One among four chickens placed in a cage at the downwind end of the row was inoculated orally with 10(9) colony-forming units of S. enteritidis. Cecal droppings, drinking water, and feed were cultured every day. Horizontal transmission was rapid in the row with low air velocity but slow in the row with high air velocity. However, in another experiment, where the inoculated chicken was situated in a cage upstream in the airflow, horizontal transmission was equally rapid whether the airflow was rapid or slow. Contamination of feed and water never preceded the appearance of positive cecal droppings. These findings suggest that the rapidity of horizontal transmission of S. enteritidis may be affected by airflow patterns.
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