Abstract
About one thousand calves of the native Japanese breed on pasture were found infected with infections suppurative bronchopnenmonia in the Noto district, ISHIKAWA Prefecture, over a period from 1964 to 1968. Of them, 34 calves (3%) succumbed or were condemned.
Etiological investigation revealed that they were cases of shipping fever induced by mixed infection with Type III parainfluenza virus, adenovirus, Pseudomonas aeruginosa, Proteus, Alcaligenes faecalis, Escherichia coli, Haemophilus, and Alkalescens dispar.
After an incubation period of about ten days, an infected calf manifested pyrexia, coughing, nasal discharge, mucous rale, and diarrhea. It took two weeks to more than a month for the calf to recover. Death occurred sometimes. Stress from changes in environment was an inportant factor to induce infection. Transmission was direct or indirect and mild. The infection might become enzootic and hard to control.
