Pathology of Chronic Mycoplasma ovipneumoniae Carriers in a Declining Bighorn Sheep (Ovis canadensis) Population.

Autor:	Malmberg JL; Department of Veterinary Sciences, University of Wyoming, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA.; Wyoming State Veterinary Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070.; Current affiliation and address: National Wildlife Research Center, Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, 4101 LaPorte Avenue, Fort Collins, Colorado 80521, USA., Allen SE; Wyoming Game and Fish Department, Veterinary Services, 1212 South Adams Street, Laramie, Wyoming 82070, USA., Jennings-Gaines JE; Wyoming Game and Fish Department, Veterinary Services, Wildlife Health Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA., Johnson M; Wyoming Game and Fish Department, Veterinary Services, Wildlife Health Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA., Luukkonen KL; Wyoming Game and Fish Department, Veterinary Services, Wildlife Health Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA., Robbins KM; Wyoming Game and Fish Department, Veterinary Services, Wildlife Health Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA., Cornish TE; California Animal Health and Food Safety Lab, University of California-Davis, 18760 Road 112, Tulare, California 93274, USA., Smiley RA; University of Wyoming, Haub School of the Environment and Natural Resources, Wyoming Cooperative Fish and Wildlife Research Unit, Department of Zoology and Physiology, 804 East Fremont Street, Laramie, Wyoming 82071, USA., Wagler BL; University of Wyoming, Haub School of the Environment and Natural Resources, Wyoming Cooperative Fish and Wildlife Research Unit, Department of Zoology and Physiology, 804 East Fremont Street, Laramie, Wyoming 82071, USA., Gregory Z; Wyoming Game and Fish Department, 260 Buena Vista Drive, Lander, Wyoming 82520, USA., Lutz D; Wyoming Game and Fish Department, 260 Buena Vista Drive, Lander, Wyoming 82520, USA., Hnilicka P; US Fish and Wildlife Service, 170 North First Street, Lander, Wyoming 82520, USA., Monteith KL; University of Wyoming, Haub School of the Environment and Natural Resources, Wyoming Cooperative Fish and Wildlife Research Unit, Department of Zoology and Physiology, 804 East Fremont Street, Laramie, Wyoming 82071, USA., Edwards WH; Wyoming Game and Fish Department, Veterinary Services, Wildlife Health Laboratory, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA.
Jazyk:	angličtina
Zdroj:	Journal of wildlife diseases [J Wildl Dis] 2024 Apr 01; Vol. 60 (2), pp. 448-460.
DOI:	10.7589/JWD-D-23-00132
Abstrakt:	Bighorn sheep (Ovis canadensis) across North America commonly experience population-limiting epizootics of respiratory disease. Although many cases of bighorn sheep pneumonia are polymicrobial, Mycoplasma ovipneumoniae is most frequently associated with all-age mortality events followed by years of low recruitment. Chronic carriage of M. ovipneumoniae by adult females serves as a source of exposure of naïve juveniles; relatively few ewes may be responsible for maintenance of infection within a herd. Test-and-remove strategies focused on removal of adult females with evidence of persistent or intermittent shedding (hereafter chronic carriers) may reduce prevalence and mitigate mortality. Postmortem confirmation of pneumonia in chronic carriers has been inadequately reported and the pathology has not been thoroughly characterized, limiting our understanding of important processes shaping the epidemiology of pneumonia in bighorn sheep. Here we document postmortem findings and characterize the lesions of seven ewes removed from a declining bighorn sheep population in Wyoming, USA, following at least two antemortem detections of M. ovipneumoniae within a 14-mo period. We confirmed that 6/7 (85.7%) had variable degrees of chronic pneumonia. Mycoplasma ovipneumoniae was detected in the lung of 4/7 (57.1%) animals postmortem. Four (57.1%) had paranasal sinus masses, all of which were classified as inflammatory, hyperplastic lesions. Pasteurella multocida was detected in all seven (100%) animals, while Trueperella pyogenes was detected in 5/7 (71.4%). Our findings indicate that not all chronic carriers have pneumonia, nor do all have detectable M. ovipneumoniae in the lung. Further, paranasal sinus masses are a common but inconsistent finding, and whether sinus lesions predispose to persistence or result from chronic carriage remains unclear. Our findings indicate that disease is variable in chronic M. ovipneumoniae carriers, underscoring the need for further efforts to characterize pathologic processes and underlying mechanisms in this system to inform management. (© Wildlife Disease Association 2024.)
Databáze:	MEDLINE
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