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  • Title: An epornitic of fatal chlamydiosis (ornithosis) in South Carolina turkeys.
    Author: Page LA, Derieux WT, Cutlip RC.
    Journal: J Am Vet Med Assoc; 1975 Jan 15; 166(2):175-8. PubMed ID: 1112744.
    Abstract:
    An unusual epornitic of fatal chlamydiosis occurred in a flock of 10,283 domestic turkeys in South Carolina. Total mortality over a 2-week period was 483 birds (4.7% of the flock). The principal gross lesion was severe pericarditis, but there was little or no airsacculitis, an observation at variance with many previous reports of chlamydiosis. Furthermore, an unusually heavy infestation of the turkeys with sanguivorous black flies (Simulium slossonae and S congareenarum) was observed at the time of the epornitic, an occurrence that may have permitted rapid transmission of chlamydiae between turkeys in the affected flock. The strains of Chlamydia psittaci isolated from naturally infected turkeys caused pericarditis and heptopathy as well as occasional airsacculitis, with a 41% mortality in intravenously (IV) inoculated turkeys. Turkeys inoculated intramuscularly (IM) or intraperitoneally (IP) did not die; however, airsacculitis was observed in more than 85% of turkeys inoculated intraperitoneally or exposed to infection by pen contact with inoculated turkeys. The strain was highly infectious but not lethal by the latter method of transmission. The strain was similar to other virulent chlamydiae isolated from turkeys, in that small numbers of the organism caused fatal infection in guinea pigs when inoculated IP.
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