BVD

BVD (Bovine Virus Diarrhea) infection can cause numerous
problems, such as damage to the digestive and immune systems,
pneumonia, abortions, calf deformities, and others.  Clinical signs in
newborn calves infected with BVD include fever, nasal discharge,
diarrhea, and inability to move about normally.

Unfavorable reactions frequently follow the use of modified live virus  
BVD vaccines. The risk of these vaccination reactions should be
weighed against the probability of losses resulting from BVD
infection before a decision is made about using MLV-BVD vaccines.
Appropriate recommendations should be made by the attending
veterinarian after he has assessed the local BVD situation.