Aerosol vaccination of pigs against Mycoplasma hyopneumoniae infection.
Am J Vet Res
; 54(11): 1874-80, 1993 Nov.
Article
em En
| MEDLINE
| ID: mdl-8291766
ABSTRACT
Aerosol vaccination is used effectively to immunize poultry against Newcastle disease, but to the authors' knowledge, this vaccination procedure is not well studied in other species. The efficacy of IM and aerosol vaccination of pigs against Mycoplasma hyopneumoniae infection was evaluated. Twenty-one pigs from a Mycoplasma-free herd were randomly allotted by litter and body weight into 3 groups. One group was given aerosolized phosphate-buffered saline solution (PBSS) by inhalation. The second group (AERO) was given aerosolized M hyopneumoniae vaccine by inhalation. The third group (IM) was given the same vaccine by IM injection. Vaccination by IM administration was repeated once, and aerosol vaccination was repeated twice at 2-week intervals. Two weeks after the last vaccination, all pigs were intratracheally challenge-exposed with 3 ml of broth culture containing 10(7) color-changing units (CCU) of a low-passage strain of virulent M hyopneumoniae. Pigs were observed daily for coughing. Four weeks after challenge exposure, all pigs were necropsied. Percentage of lung affected by gross pneumonia was measured, bronchioalveolar lavage fluid (BALF) cells were counted, and quantitative culture for mycoplasmas was performed on lung sections. Additionally, M hyopneumoniae-specific antibodies were measured in prevaccination, postvaccination, and postchallenge-exposure serum and BALF by use of indirect ELISA. Mean prevalence of persistent coughing in pigs of the AERO group (4.6 d/pig) was not different from that in pigs of the PBSS group (3.7 d/pig). Prevalence of coughing in IM vaccinated pigs (1.0 d/pig) was lower (P < 0.05) than that in pigs of the PBSS group.(ABSTRACT TRUNCATED AT 250 WORDS)
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Base de dados:
MEDLINE
Assunto principal:
Pneumonia
/
Doenças dos Suínos
/
Vacinas Bacterianas
/
Infecções por Mycoplasma
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Am J Vet Res
Ano de publicação:
1993
Tipo de documento:
Article