| 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 ... | 2006 | 16506443 |
| prevalence of antibodies to serotypes of bluetongue virus and anaplasma marginale in montana feeder cattle: 2002-2003. | in a serologic survey of montana-source weaned calves and yearling cattle, the apparent prevalence of antibodies to bluetongue virus was 0.68% and 1.26% in 2002 and 2003, respectively, and to anaplasma marginale at a positive cutoff at 30% inhibition it was 1.82% and 1.35% in 2002 and 2003, and at a positive cutoff at 42% inhibition it was 0.76% and 0.55% in 2002 and 2003, respectively, suggesting that the risk of importing infected animals was very low. | 2006 | 16898114 |
| seroprevalence of anaplasma marginale in 2 iowa feedlots and its association with morbidity, mortality, production parameters, and carcass traits. | a prospective cohort observational study was conducted to investigate the seroprevalence of anaplasma marginale in iowa feedlots and its association with morbidity, mortality, and treatment costs. blood samples were taken from 659 calves from 31 consigners at processing and classified as seropositive to a. marginale using a competitive enzyme-linked immunosorbent assay (celisa) with a 30% cutoff. health and production parameters were modeled by a. marginale serostatus with mixed model regression ... | 2010 | 21037886 |
| genetic characterization of anaplasma ovis strains from bighorn sheep in montana. | wildlife reservoir species and genetic diversity of anaplasma ovis (rickettsiales: anaplasmataceae) have been poorly characterized. bighorn sheep (ovis canadensis), captured in montana from december 2004 to january 2005, were tested for antibodies to anaplasma spp.; the presence of a. ovis was determined by the characterization of major surface protein msp4 sequences. anaplasma antibodies were detected in 25/180 (14%) sampled bighorn sheep and a. ovis msp4 sequences were amplified by polymerase ... | 2006 | 16870861 |
| prevalence of antibodies to bluetongue virus and anaplasma marginale in montana yearling cattle entering alberta feedlots: fall 2001. | a serologic survey was conducted in yearling cattle imported into alberta feedlots from montana during october 2001 to estimate the prevalence of antibodies to bluetongue virus (btv) and anaplasma marginale in montana yearling cattle. the apparent prevalence of antibodies to btv when the competitive enzyme-linked immunosorbent assay (celisa) was used was 0.37% (21/5608). test positive celisa samples were also all positive when tested by virus neutralization (vn) and they reacted to 1 or more btv ... | 2004 | 15283518 |
| sequence analysis of the msp4 gene of anaplasma ovis strains. | anaplasma ovis (rickettsiales: anaplasmataceae) is a tick-borne pathogen of sheep, goats and wild ruminants. the genetic diversity of a. ovis strains has not been well characterized due to the lack of sequence information. in this study, we evaluated bighorn sheep (ovis canadensis) and mule deer (odocoileus hemionus) from montana for infection with a. ovis by serology and sequence analysis of the msp4 gene. antibodies to anaplasma spp. were detected in 37% and 39% of bighorn sheep and mule deer ... | 2007 | 17052866 |