title: Severe mortality in broiler chickens associated with Mycoplasma synoviae and Pasteurella gallinarum.
abstract: Severe economic loss due to high mortality and condemnation rates occurred on two commercial broiler facilities. Chickens had moderate-to-severe airsacculitis, pericarditis, perihepatitis, tracheitis, and synovitis. Pasteurella gallinarum was isolated from 16 of 18 pericardia, four of 14 livers, 11 of 16 air sacs, six of seven joints and one of 28 tracheas in pure culture. In addition, Mycoplasma synoviae was isolated from trachea and air sac. Lesions were suggestive of an Escherichia coli septicemia, but E. coli was isolated from only four of 28 tracheas and one of 14 livers in pure culture. A coronavirus was isolated from trachea and lung. Whether this coronavirus represented a vaccine or field strain of infectious bronchitis was not determined. These findings suggested that the severe lesions were due to a concomitant infection with an atypical strain of P. gallinarum.
authors.affiliation: California Veterinary Diagnostic Laboratory System, University of California, Davis, Fresno 93725.
authors.forename: R
authors.initials: R
authors.lastname: Droual
authors.forename: H L
authors.initials: HL
authors.lastname: Shivaprasad
authors.forename: C U
authors.initials: CU
authors.lastname: Meteyer
authors.forename: D P
authors.initials: DP
authors.lastname: Shapiro
authors.forename: R L
authors.initials: RL
authors.lastname: Walker
mesh_terms: D000818:Animals; D002645:Chickens / Q000382:microbiology*; D004196:Disease Outbreaks / Q000662:veterinary; D009175:Mycoplasma Infections / Q000401:mortality / Q000473:pathology / Q000662:veterinary*; D010326:Pasteurella Infections / Q000401:mortality / Q000473:pathology / Q000662:veterinary*; D011201:Poultry Diseases / Q000382:microbiology / Q000401:mortality* / Q000473:pathology