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prevalence of actinobacillus pleuropneumoniae, actinobacillus suis, haemophilus parasuis, pasteurella multocida, and streptococcus suis in representative ontario swine herds.tonsillar and nasal swabs were collected from weanling pigs in 50 representative ontario swine herds and tested for the presence of 5 important bacterial upper respiratory tract pathogens. all but 1 herd (2%) tested positive for streptococcus suis by polymerase chain reaction (pcr); 48% of herds were s. suis serovar 2, 1/2 positive. in all but 2 herds there was evidence of haemophilus parasuis infection. in contrast, toxigenic strains of pasteurella multocida were detected by a p. multocida--enz ...200818505187
porcine haemophilus pleuropneumonia epizootic in southwestern ontario: clinical, microbiological, pathological and some epidemiological findings.a fibrinous necrotizing pleuropneumonia with a predominant mononuclear cell infiltrate commenced january 1978. the pneumonia, caused by haemophilus pleuropneumoniae assumed epizootic proportions and affected mainly feeder pigs in the intensive pig rearing area of southwestern ontario. a few abortions occurred. winter storms, recent transportation and other potentially stressful situations were associated with herd outbreaks. broad spectrum antibiotics were usually effective in stopping deaths.19817272838
epidemiology of haemophilus pleuropneumoniae infection in pigs: a survey of ontario pork producers, 1981.information about factors associated with the spread and the effect of pleuropneumonia was obtained from 418 pork producers in ontario, who returned a mailed questionnaire. the overall herd prevalence of pleuropneumonia was 23.2%. the prevalence among herds with feeder pigs only was 34.3% and 16% among sow herds. the chance of pleuropneumonia breaking out in a herd was increased with increased traffic of pigs into the herd. the source of supplementary stock had an important effect on the chance ...19836831302
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