| 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 ... | 1983 | 6831302 |
| 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. | 1981 | 7272838 |
| 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 ... | 2008 | 18505187 |