Pasteurella haemolytica serotype 1 colonization of the nasal passages of virus-infected calves |
| |
| Authors: | G H Frank R E Briggs K G Gillette |
| |
| Institution: | National Animal Disease Center, US Department of Agriculture, Ames, IA 50010. |
| |
| Abstract: | Nasal passages of calves with a virus-induced respiratory tract disease became colonized by Pasteurella haemolytica serotype 1 after they were inoculated intranasally with P haemolytica. Inoculation with infectious bovine rhinotracheitis virus caused a more severe clinical illness and resulted in a greater degree of colonization with P haemolytica than developed after inoculation with parainfluenza-3 virus. Nasal passages of parainfluenza-3 virus-inoculated calves were colonized to a greater degree with P haemolytica than were those of healthy, nonstressed calves. Calves were susceptible to P haemolytica colonization during or shortly after virus-induced illness, even though they had been previously exposed to P haemolytica and had serum antibody and nasal secretion antibody to P haemolytica. |
| |
| Keywords: | |
|
|
