PNEUMONIA IN ADULT CATTLE
Most common pathogens are Mannheimia haemolytica, Pasteurella multocida, Histophilus somni and Mycoplasma spp, often in conjunction with viral pathogens.
Although diagnostics are rarely pursued, they should be considered for valuable animals or in outbreaks.
Culture and susceptibility testing can be performed from transtracheal wash, bronchoalveolar lavage or post-mortem specimens. Mannheimia can be associated with pleuropneumonia, which carries a very poor prognosis.
Oxytetracycline most appropriate. Ceftiofur has limited activity against Mycoplasma spp.
DURATION OF THERAPY
Dependent on severity. 2-3 days may be adequate in mild cases. Treat until disease resolved, which may take > 1 week in severe cases.