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Serological response to Actinobacillus pleuropneumoniae serovar 7 infection in a commercial pig herd
Author(s) -
GARDNER IA,
BOSSÉ JT,
SHELDRAKE RF,
ROSENDAL S,
JOHNSON RP
Publication year - 1991
Publication title -
australian veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.382
H-Index - 59
eISSN - 1751-0813
pISSN - 0005-0423
DOI - 10.1111/j.1751-0813.1991.tb00732.x
Subject(s) - actinobacillus pleuropneumoniae , mycoplasma hyopneumoniae , pleuropneumonia , serology , serotype , seroconversion , antibody , herd , vaccination , pneumonia , biology , medicine , virology , veterinary medicine , immunology
SUMMARY Serological responses to Actinobacillus pleuropneumonlae 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<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>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.