Neuraminidase activity of Pasteurella haemolytica isolates

Neuraminidase activities of Pasteurella haemolytica cell suspensions were measured. Type isolates of the 12 established serotypes and bovine and ovine field isolates were included in the study. Neuraminidase activities ranged from 0 to 0.87 U per mg (dry weight) of P. haemolytica. Activity levels among the isolates studied were serotype associated.