Serological response to Actinobacillus pleuropneumoniae serovar 7 infection in a commercial pig herd.

Ian Gardner, J. T. Bossé, R. F. Sheldrake, S. Rosendal, R. P. Johnson

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Serological responses to Actinobacillus pleuropneumoniae serovar 7 infection were monitored by enzyme-linked immunosorbent assay in a cohort of 66 pigs between weaning and market. Antibody concentrations were high (63/65 seropositive) at 4 weeks of age but declined to low levels from 8 to 12 weeks. Mean antibody concentrations rose significantly (p less than 0.001) between 12 and 23 weeks. Between 8 and 23 weeks of age, 33 (51.5%) of 64 surviving pigs seroconverted to A pleuropneumoniae serovar 7. Peak antibody concentrations in the seroconverting pigs usually (28/33) occurred at 23 weeks. Seroconversion to A pleuropneumoniae during the grower/finisher phase was not significantly associated (p greater than 0.05) with passive antibody concentrations at 4 weeks of age, lack of vaccination against Mycoplasma hyopneumoniae, or weaning weight. Pleuropneumonic lesions were evident at slaughter in 4 (6.3%) of 64 pigs. A pleuropneumoniae serovar 7 was isolated from 2 of 4 lungs with pleuropneumonia and from another lung with lesions considered typical of enzootic pneumonia.

Original languageEnglish (US)
Pages (from-to)349-352
Number of pages4
JournalAustralian Veterinary Journal
Volume68
Issue number11
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

  • veterinary(all)

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