Publications

prevalence of antibodies to mycoplasma hyopneumoniae in iowa swine.	the prevalence of complement-fixing antibodies to mycoplasma hyopneumoniae was determined in 7,321 sera collected from breeding swine of various ages. samples were selected randomly in approximate proportion to the number of hogs marketed annually from each of 9 crop-reporting areas in iowa. testing was accomplished by means of a microtiter complement-fixation test. of the 7,321 sera, 22% had antibody titers of 1:4 or greater to m hyopneumoniae. of the 597 herds sampled, 60% or 357 had at least ...	1983	6638651
prevalence of antibodies to haemophilus pleuropneumoniae in iowa swine.	the prevalence of complement-fixing (cf) antibodies to haemophilus pleuropneumoniae in iowa swine was determined by testing samples collected randomly from each of 9 crop-reporting areas (9 to 12 counties) in iowa in approximate proportion to the number of swine marketed annually from each area. for testing, a pooled antigen composed of serotypes 1 to 5 of h pleuropneumoniae was used in a modified direct microtiter complement-fixation test. of 7,348 sera tested, 2,362 or 32.1% had cf antibodies ...	1982	7149390