| Abstract | The benefit of increased immunity to cross-reacting lipopolysaccharide core antigens of gram-negative bacteria induced by vaccination with an Rc mutant of Escherichia coli 0111:B4 (strain J5) was evaluated in commercial swine herds endemically infected with Haemophilus pleuropneumoniae. Weanling pigs were vaccinated IM with E coli J5 (group 1) before the expected time of H pleuropneumoniae infection. Clinical signs, antibiotic treatment frequency, mortality, growth performance (days to market weight), and serologic responses of the pigs were monitored for approximately 5 months after vaccination. The results were compared with those of pigs vaccinated IM with a commercial H pleuropneumoniae bacterin (group 2) and with those of nonvaccinated control pigs of the same age (group 3). The treatment frequency and growth performance were similar in the 3 groups. However, vaccination with E coli J5 or with the H pleuropneumoniae bacterin lowered mortality, compared with mortality in the controls. Serum titers against E coli J5 increased after vaccination with the E coli J5 bacterin, but were not increased by vaccination with the H pleuropneumoniae. In contrast, serum titer to E coli J5 increased in all treatment groups as a result of H pleuropneumoniae infection or exposure. The protection against lethal H pleuropneumoniae infections in swine that was provided by vaccination with the E coli J5 and the H pleuropneumoniae bacterin appeared to be immunologically distinct on the basis of serologic analysis, indicating the possibility of different mechanisms of protection. |
| Authors | B W Fenwick, B I Osburn, J S Cullor, S C Henry, H I Olander |
| Journal | American journal of veterinary research
(Am J Vet Res)
Vol. 47
Issue 9
Pg. 1888-91
(Sep 1986)
ISSN: 0002-9645 UNITED STATES |
| PMID | 3532872
(Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)
|
| Chemical References |
- Antigens, Bacterial
- Lipopolysaccharides
|
| Topics |
- Animals
- Antigens, Bacterial
(immunology)
- Escherichia coli
(immunology)
- Haemophilus Infections
(immunology, mortality, veterinary)
- Lipopolysaccharides
(immunology)
- Swine
- Swine Diseases
(immunology, microbiology, mortality)
|
