| Autor: |
Gardner IA; Department of Epidemiology and Preventive Medicine, School of Veterinary Medicine, University of California, Davis 95616., Bossé JT, Sheldrake RF, Rosendal S, Johnson RP |
| Jazyk: |
angličtina |
| Zdroj: |
Australian veterinary journal [Aust Vet J] 1991 Nov; Vol. 68 (11), pp. 349-52. |
| DOI: |
10.1111/j.1751-0813.1991.tb00732.x |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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