Veterinary advice: Hidden IBR virus flares up in cattle when they are stressed

IBR has been with us for quite a while (since 1989).

It is a herpes virus, and like another herpes virus, the common cold sore, once you get it, you have it for life.

It flares up in cattle at times of stress, like calving, bulling, weaning, inclement weather etc, causing an awful lot of shedding of new virus.