IBR is the most obvious clinical disease associated with infection by Bovine Herpesvirus 1 (BoHV-1). IBR is a disease of the upper respiratory tract which varies in severity, depending on the strain
of virus involved and other factors which may influence the immune status of the animal. In severe
cases, damage to the upper airways may lead to pneumonia and sometimes death. BoHV-1 infection has also been associated with infertility, abortion, high temperatures and milk drop.
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