Colonization of the nasal passages of calves with Pasteurella haemolytica serotype 1 and regeneration of colonization after experimentally induced viral infection of the respiratory tract
Frank, G.H.; Briggs, R.E.; Gillette, K.G.
American Journal of Veterinary Research 47(8): 1704-1707
1986
ISSN/ISBN: 0002-9645 PMID: 3752678 Document Number: 273222
Healthy nonstressed calves were inoculated intranasally with or subjected to aerosol exposure to Pasteurella haemolytical serotype 1. Only 4 of 28 calves harbored the bacterium in enough numbers to be isolated from the nasal passages for more than 7 days. After apparent clearing from the nasal passages, 8 calves were inoculated intranasally with infectious bovine rhinotracheitis virus; 2 of these calves shed the P. haemolytica during clinical illness due to the virus. The remaining 20 calves were aerosol-exposed to parainfluenza-3 virus; 6 of these calves shed P. haemolytica during clinical illness due to the parainfluenza-3 virus.