http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Seroepidemiology of Babesia bovis, B. bigemina, Anaplasma marginale, bluetongue virus and Brucella abortus in cattle in five Mexican states
Sera collected in 1982 and 1983 from 40 ranches in the northeastern Mexican states of Nuevo Leon, Tamaulipas, and Coahuila were tested for the presence of antibody activity to Babesia bovis, and B. bigemina using the indirect fluorescent antibody test, to Anaplasma marginale using the card test, to bluetongue virus using the immunodiffusion test and to Brucella abortus using the enzyme-linked immunosorbent assay. Serum samples from approximately 50 cattle on each of five additional ranches in the states of Nuevo Leon and San Luis Potosi were collected monthly from February through November of 1983. These sera were tested as above to determine incidence rates for infection with Babesia spp., A. marginale and bluetongue virus. Herd prevalence rates for either Babesia sp. ranged from 0.0 to 1.0 Average herd prevalence rates were 0.50 and 0.56 for B. bovis and B. bigemina, respectively.Herd prevalence rates ranged from 0.0 to 0.86 with a mean of 0.22 for A. marginale, from 0.07 to 1.0 with a mean of 0.42 for bluetongue virus and from 0.0 to 0.138 with a mean of 0.024 for B. abortus. Fourteen of the 40 herds had at least one B. abortus reactor. Seroconversions to Babesia spp. occurred on two of the five ranches sampled monthly. On one ranch, 5 of 37 animals originally negative to B. bigemina became positive in late summer and fall. On the other ranch, 32 of 36 animals seroconverted to B. bigemina throughout the study period with a moderate peak in mid-summer. Only 3 of 35 animals became seropositive to B. bovis on this ranch. Seroconversions to A. marginale were detected on 4 of the 5 ranches with the majority occurring on the ranches with the new Babesia infections. Bluetongue seroconversions occurred on all five ranches. New infections were detected during late winter and spring on four ranches and throughout the study period on the fifth ranch. The significance of the results for disease control programs is discussed.
"Major subject: Veterinary Medical Sciences."
Ph. D. in Philosophy Texas A & M University 1984
Includes bibliographical references (leaves 117-135).