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Coyotes Exhibit Immune and Genetic Evidence of Rickettsial Infections in Arizona
Başlık:
Coyotes Exhibit Immune and Genetic Evidence of Rickettsial Infections in Arizona
Yazar:
Green, Eric Nathaniel, author.
ISBN:
9780438013513
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (42 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Nathan C. Nieto Committee members: Joseph D. Busch; W. Linn Montgomery; Hayley Yaglom.
Özet:
Rocky Mountain Spotted Fever (RMSF), caused by the bacterium Rickettsia rickettsii, was recognized as endemic in Arizona after a 2004 outbreak, and has been a public health concern since that time. The brown dog tick (Rhipicephalus sanguineus) is the primary vector in the state. Since it selects domesticated dogs as the primary host, free-roaming dogs in peridomestic areas have been named as the primary risk factor for human cases of RMSF. However, the sudden emergence and long-distance transmission of the pathogen have not been adequately explained, and one possible mechanism could include a wildlife component. Since coyotes are prevalent in Arizona, wide-ranging, and genetically-similar to dogs, we predicted that brown dog ticks might parasitize coyotes and that coyotes would therefore have evidence of pathogen exposure. We tested coyote sera for antibodies to R. rickettsii. Eight out of 94 (8.5%) samples were seropositive at 1:256 or higher titers. Subsequent qPCR analyses of coyote skin showed evidence for Spotted Fever Group Rickettsia in 4 out of 138 (2.9%) samples, but not for R. rickettsii. Antibodies are cross-reactive for many rickettsiae, so the positive results in serology could indicate coyotes' exposure to diverse, nontypical rickettsial species with various levels of pathogenicity. This cross-reactivity may play a role in the maintenance of rickettsial bacteria in Arizona. Although the specific mechanisms remain unknown, it is possible that Rh. sanguineus are responsible for transferring rickettsial pathogens across canine host species. Alternatively, a different pathogen-vector complex could be operating on coyotes than on dogs.
Notlar:
School code: 0391
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