INVESTIGATIONS ON THE INFLUENCE OF A BORD ETELLA LIVE VACCINE UPON OCCURRENCE AND SIGNIFICANCE OF RHINITIS ATROPHICAN SUUM AND THE INFECTION PRESSURE BY FIELD STRAINS OF THE CAUSAL AGENT
U. Ehser et al., INVESTIGATIONS ON THE INFLUENCE OF A BORD ETELLA LIVE VACCINE UPON OCCURRENCE AND SIGNIFICANCE OF RHINITIS ATROPHICAN SUUM AND THE INFECTION PRESSURE BY FIELD STRAINS OF THE CAUSAL AGENT, DTW. Deutsche tierarztliche Wochenschrift, 100(9), 1993, pp. 355-359
A field study was carried out in a large scale unit for swine breeding
and fattening with the object to influence the high morbidity rate of
Atrophic Rhinitis and pneumonia with the help of a Bordetella live va
ccine. The results show that it is possible to decrease the infectious
pressure by B. bronchiseptica and to reduce the pathomorphological si
gns of Atrophic Rhinitis in consequence of the application of the live
vaccine. The pathologic-anatomical investigations of nasal turbinates
in immunized slaughtered fattening pigs show a significant lower morb
idity concerning Atrophic Rhinitis and a higher persentage of pigs wit
hout changes at conchae nasales and septum nasi. We find also a lower
contamination of the air with B. bronchiseptica field strains during v
accine application. The results also explain that a high infectious pr
essure by B. bronchiseptica and the possibility of communication betwe
en unvaccinated and vaccinated groups of pigs counteract a better effi
ciency of the vaccine. The decrease of the morbidity rate of Atrophic
Rhinitis appears so much more important because toxinogenious Pasteure
lla multocida strains were isolated from nasal swabs of vaccinated pig
s during the investigations. But these strains influenced the Atrophic
Rhinitis frequency only accidentally. All results as a whole point ou
t that in pig houses with a high animal density one has to pay more at
tention to virulent B. bronchiseptica strains than it was been done ti
ll now.