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Overview of the virulence attributes of the HAP-group of bacteria.

The pathogenicity requirements of the HAP bacteria include colonization of mucous surfaces, invasion of the host tissues, survival and multiplication in the host, interference with the defences of the host, and damage to the host. For these purposes the bacteria possess adhesion structures, capsular polysaccharides, surface structures such as outer membrane proteins, and lipopolysaccharides. They also secrete extracellular products, including exotoxins. The information available in this context for the major pathogens of the HAP group is reviewed.

Actinobacillus Infections↗

[Exotic zoonoses].

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Animals↗

Immune responses of lambs experimentally infected with bovine respiratory syncytial virus and Pasteurella haemolytica.

The immune responses of lambs experimentally infected with bovine respiratory syncytial virus (RSV) and Pasteurella haemolytica were compared with lambs infected with bovine RSV or Pasteurella haemolytica alone. Superinfection with P. haemolytica aggravated the reduction in the number of CD5+, CD4+ and LCA p220+ (B) lymphocytes caused by bovine RSV, but it had no effect on the neutralizing antibodies against P. haemolytica cytotoxin. Serum samples obtained from lambs experimentally infected with bovine RSV and P. haemolytica had significantly lower amounts of neutralizing antibodies to bovine RSV than those obtained from lambs infected with bovine RSV alone.

Animals↗