Fatal pneumonia epizootic in musk ox (Ovibos moschatus) in a period of extraordinary weather conditions.
The musk ox is adapted to extreme cold and regarded as vulnerable to the impacts of climate change. Population decline is proposed to occur due to changes in forage availability, insect harassment, parasite load, and habitat availability, while the possible role of infectious diseases has not been emphasized. The goal of the present article is to describe an outbreak of fatal pasteurellosis that occurred in the introduced musk ox population of Dovrefjell, Norway in 2006, causing the death of a large proportion of the animals. The epizootic coincided with extraordinary warm and humid weather, conditions that often are associated with outbreaks of pasteurellosis. The description is based on long series of data from the surveillance of the musk ox population, weather data from a closely located meteorological station, and pathoanatomical investigation of the diseased animals. It is concluded that the weather conditions likely were the decisive factors for the outbreak. It is suggested that such epizootics may occur increasingly among cold-adapted animals if global warming results in increased occurrence of heat waves and associated extreme weather events, thereby causing population declines and possibly extinctions.
Ytrehus
Bjørnar
B
Section for Wildlife Diseases, National Veterinary Institute, Oslo, Norway. bjornar.ytrehus@vetinst.no
Bretten
Tord
T
Bergsjø
Bjarne
B
Isaksen
Ketil
K
D000222:Adaptation, Physiological; D000822:Animal Husbandry; D000818:Animals; D001110:Arctic Regions; D003081:Cold Climate; D004196:Disease Outbreaks / Q000662:veterinary*; D017753:Ecosystem; D005843:Geography; D017752:Greenhouse Effect; D031121:Mannheimia / Q000302:isolation & purification; D009664:Norway / Q000453:epidemiology; D010325:Pasteurella / Q000302:isolation & purification; D012766:Pasteurellosis, Pneumonic / Q000097:blood / Q000209:etiology / Q000401:mortality*; D012418:Ruminants / Q000276:immunology / Q000382:microbiology* / Q000502:physiology; D014887:Weather
Acta Vet Scand. 1976;17(4):488-94
1015481
Nature. 2007 May 31;447(7144):E4-5; discussion E5-6
17538572
J Wildl Dis. 1986 Apr;22(2):264-6
3712652
Vet Microbiol. 2008 Feb 5;127(1-2):10-20
17768017
Science. 2005 Sep 9;309(5741):1680-1
16150997
Proc Biol Sci. 2005 Dec 22;272(1581):2571-6
16321777
Nature. 2006 Jan 12;439(7073):161-7
16407945
Integr Comp Biol. 2004 Apr;44(2):109-18
21680491
Dtsch Tierarztl Wochenschr. 2002 Apr;109(4):193-200
11998372
Nature. 2006 Jan 12;439(7073):143-4
16407936
Nature. 2007 May 31;447(7144):E3-4; discussion E5-6
17538571
J Wildl Dis. 1984 Oct;20(4):319-27
6530718
Epidemiology. 2002 Jul;13(4):373-5
12094088
Science. 2002 Jun 21;296(5576):2158-62
12077394
BMC Evol Biol. 2005 Oct 06;5:49
16209705
Conserv Biol. 2006 Oct;20(5):1349-57
17002752