Cross-protection study of a Mannheimia haemolytica serotype 1 vaccine against acute pasteurellosis in lambs induced by a serotype 2 strain.

Abstract Ovine pneumonia is an economic important disease worldwide for the sheep industry. Multiple serotypes (S) of Mannheimia haemolytica are involved in the disease and S2 and S1 are the most frequent isolates associated with lung lesions in sheep. Vaccines based on some M. haemolytica S2 strains have been shown to have poor immunogenicity. The objective of this study was to determine the cross-protection effect of an S1 strain based vaccine, Bovilis MH, in sheep against an experimental challenge with an S2 strain. Lambs ( n  = 12) in the vaccine group were injected subcutaneously with 1 ml of the Bovilis MH vaccine, and revaccinated 4 weeks later, while the control group ( n  = 12) received 1 ml of saline at each occasion. Two weeks after revaccination, all lambs were challenged intratracheally with parainfluenza virus 3, and with an M. haemolytica S2 strain at day 7 post-viral challenge. The proportion of animals having pyrexia in the first 2 days post-bacterial challenge was significantly less in the vaccine group compared to the control group ( P P P