Influence of Bordetella avium infection on association of Escherichia coli with turkey trachea.
Four-week-old B. avium-infected and B. avium-free turkeys were inoculated intratracheally with a suspension of fimbriated or nonfimbriated E. coli. Numbers of E. coli associated with tracheal sections were determined at 1 or 6 hours after inoculation. Significantly greater numbers of E. coli were isolated from the tracheas of B. avium-infected turkeys compared with numbers in B. avium-free turkeys. In B. avium-free turkeys, the number of colony forming units of tracheal associated E. coli was 90% lower 6 h than at 1 h after inoculation. However, in B. avium-infected turkeys, numbers of E. coli were not affected by postinoculation time. It was concluded that B. avium-infected turkeys had a reduced capacity to clear E. coli from the trachea.