Rhinotrachéite Infectieuse Bovine Chez Les Vaches Laitières au Québec.

An outbreak of infectious rhinotracheitis affecting four herds of dairy cattle was observed in the Province of Quebec, the general characteristics of which are the same as those reported in the infection of feedlot cattle.However, a 25% average decrease in the milk production of affected herds was noticed during the present infection, thus stressing a particular economic aspect. The nature of the viruses isolated during this outbreak and those described previously in North America is identical.