| the effect of management factors on the seroprevalence of anaplasma marginale in bos indicus cattle in the mexican tropics. | a cross-sectional study with a two-stage design and proportional distribution was carried out to determine the effect of management factors on the seroprevalence of anaplasma marginale in bos indicus cattle in the mexican tropics. serum was obtained from 384 cattle aged 1-2 years on 92 farms. the number of samples was proportionally distributed according to the number of farms in eastern yucatan. antibody activity against a. marginale was assessed using the card agglutination test. a primary scr ... | 2004 | 14998312 |