| 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 |
| increased prevalence of torque teno viruses in porcine respiratory disease complex affected pigs. | the role of swine torque teno sus viruses (ttsuvs) as co-factors in disease syndromes involving porcine circovirus strain 2 (pcv2) and porcine reproductive and respiratory disease syndrome virus (prrsv) has been a debatable subject. in this study, the prevalence of ttsuvs in iowa, the leading pork producing state in the u.s., was estimated by a duplex pcr. the pcr is capable of simultaneously detecting both teno sus viruses 1 and 2 (ttsuv1 and 2). based on an analysis of 300 random samples repre ... | 2011 | 22227415 |