Affiliation:
1. Department of Veterinary Science, Louisiana State University, Baton Rouge, Louisiana 70803
Abstract
The synergistic role of infectious bronchitis virus (IBV) and mixed infections of
Mycoplasma synoviae
(MS) and
Escherichia coli
(EC) in the airsacculitis syndrome was evaluated in gnotobiotic chickens. Relative air sac lesion score indexes, in descending order of severity, from various combinations of organisms were: 9.5—IBV, MS, EC; 6.8—IBV, EC; 4.5—IBV, MS; 2.7—IBV; and 0.5—MS, EC. Infectious bronchitis virus caused a mild fibrinous inflammation.
M. synoviae
combined with IBV increased heterophilic and follicular lymphoid infiltration and mortality.
E. coli
combined with IBV increased exudation and prolonged airsacculitis. Concentrations of fibrinogen, gamma globulin, and total plasma proteins were elevated significantly by combined infections of IBV, MS, and EC (
P
< 0.01).
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Immunology,Microbiology,Parasitology
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