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evaluation of free-roaming mule deer as carriers of anaplasmosis in an area of idaho where bovine anaplasmosis is enzootic.samples of blood from 87 rocky mountain mule deer (odocoileus hemionus hemionus) were inoculated into 3 susceptible splenectomized calves to determine the anaplasmosis carrier status of the deer. the deer were trapped along the idaho-utah state boundary, near stone, id. acute anaplasmosis was induced in 2 of the 3 inoculated calves, and blood from the 3 calves caused anaplasmosis when inoculated into adult non-splenectomized cattle. serum rapid card agglutination testing revealed 13 (14.9%) posi ...1977833034
distribution, seasonality, and hosts of the rocky mountain wood tick in the united states.anaplasma marginale theiler is a tick-borne pathogen that causes anaplasmosis in cattle. there are approximately 20 tick species worldwide that are implicated as vectors of this pathogen. in the united states, dermacentor andersoni stiles and dermacentor variabilis (say) are the principal vectors. the risk of transmission of anaplasmosis to cattle has been largely based on the distribution of d. andersoni in the united states. we developed a centralized geographic database that incorporates coll ...200616506443
a canadian bison isolate of anaplasma marginale (rickettsiales: anaplasmataceae) is not transmissible by dermacentor andersoni (acari: ixodidae), whereas ticks from two canadian d. andersoni populations are competent vectors of a u.s. strain.anaplasma marginale theiler is a tick-borne rickettsial pathogen of cattle with a global distribution in both temperate and tropical regions. the pathogen is endemic in regions within the united states, whereas the canadian cattle population is considered to be free ofa. marginale. farmed bison, bison bison l., in central saskatchewan have been found to be infected with a. marginale; however, there is no evidence of transmission from bison to cattle. we tested a saskatchewan bison isolate of a. ...200617017236
transmission of anaplasma marginale by boophilus microplus: retention of vector competence in the absence of vector-pathogen interaction.whether arthropod vectors retain competence for transmission of infectious agents in the long-term absence of vector-pathogen interaction is unknown. we addressed this question by quantifying the vector competence of two tick vectors, with mutually exclusive tropical- versus temperate-region distributions, for genetically distinct tropical- and temperate-region strains of the cattle pathogen anaplasma marginale. the tropical cattle tick boophilus microplus, which has been eradicated from the con ...200312904396
strain composition of the ehrlichia anaplasma marginale within persistently infected cattle, a mammalian reservoir for tick transmission.tick-borne ehrlichial pathogens of animals and humans require a mammalian reservoir of infection from which ticks acquire the organism for subsequent transmission. in the present study, we examined the strain structure of anaplasma marginale, a genogroup ii ehrlichial pathogen, in both an acute outbreak and in persistently infected cattle that serve as a reservoir for tick transmission. using the msp1alpha genotype as a stable strain marker, only a single genotype was detected in a disease outbr ...200111158120
dermacentor variabilis (say) (acarina: ixodidae) established in southeastern washington and northern idaho. 19715157834
epidemiologic aspects of bovine anaplasmosis in semiarid range conditions of south central idaho.the prevalance of anaplasma marginale-infected cows, as determined by use of the modified rapid card agglutination (mrca) test, was measured during a 4-year period (1980-1983). the prevalence of a marginale-infected cows, defined as positive reactors on the mrca test, remained constant (31%-37%). the apparent incidence of a marginale transmission to susceptible cows was approximately 7% from 1980 to 1981, 8% from 1981 to 1982, and no transmission from 1982 to 1983. the occasional mrca-positive c ...19863963555
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