detection of antibodies and risk factors for infection with bovine respiratory syncytial virus and parainfluenza virus-3 in beef cattle of yucatan, mexico.we collected blood samples from 756 > or =2-year-old cattle in 54 herds in yucatan, mexico, and used all of those to determine the antibody seroprevalences (in an indirect enzyme-linked inmunosorbance assay) to bovine respiratory syncytial virus (brsv) and risk factors for animal-level seropositivity. we used 728 of the same samples (from 52 of the same herds) to do the same for parainfluenza virus-3 (piv3). cattle were selected by two-stage cluster sampling. herd-level and animal-level risk fac ...200717590461
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