Sunday, August 15, 2010

PNEUMONIA, OVINE - USA (09): (MONTANA) BIGHORN SHEEP

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Date: Sat 14 Aug 2010
From: Anne Justice-Allen [edited]


[re: ProMED-mail: Pneumonia, ovine - USA (08): (MT) bighorn sheep
20100814.2794]
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Regarding the comment by the moderator, while _Mannheimia haemolytica_ and
_Pasteurella multocida_ have both been identified in bighorn sheep with
pneumonia, _Mycoplasma ovipneumoniae_ was also isolated from many of the
sheep in the outbreaks in 2010 (in some instances, from 100 per cent of the
animals sampled). To date, no viruses have been positively linked to the
outbreaks but many wild sheep herds have titers to parainfluenza 3 and
(bovine) respiratory syncytial viruses and one report detected a 4-fold
increase in titers to these viruses. Researchers have had difficulty
reproducing the severe pneumonia that occurs in the bighorns with _M.
ovipneumoniae_ alone. It could be that like _M. dispar_ in calves, that
coinfection with a mycoplasma and pasteurella causes a more severe disease
syndrome. In addition, it has been determined that a leukotoxin produced by
_M. haemolytica_ serotype A1 is virulence factor for bighorn sheep.

References
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1. Besser TE, Cassirer EF, Potter KA, VanderSchalie J, et al. Association
of _Mycoplasma ovipneumoniae_ infection with population-limiting
respiratory disease in free-ranging Rocky Mountain bighorn sheep (_Ovis
canadensis canadensis_). J Clin Microbiol. 2008; 46(2): 423-30 [available
at ].
2. Dassanayake RP, Shanthalingam S, Herndon CN, Lawrence PK, et al.
_Mannheimia haemolytica_ serotype A1 exhibits differential pathogenicity in
two related species, _Ovis canadensis _and _Ovis aries_. Vet Microbiol.
2009; 133(4): 366-71 [abstract available at
].
3. Rudolph KM, Hunter DL, Rimler RB, Cassirer EF, et al. Microorganisms
associated with a pneumonic epizootic in Rocky Mountain bighorn sheep
(_Ovis canadensis canadensis_). J Zoo Wildl Med. 2007; 38(4):548-58
[abstract available at ].

--
Anne Justice-Allen, DVM
Wildlife Health Specialist
Arizona Game and Fish Department
USA


[Dr Justice-Allen's comments are appreciated by this moderator. - Mod.TG]

[see also:
Pneumonia, ovine - USA (08): (MT) bighorn sheep 20100814.2794]

.................tg/mj/sh



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