“Bovine Viral Diarrhea Virus- Persistently Infected”

To become a “PI” the fetus is exposed to the virus between 45-125 days (first or second trimester) . They will remain a “PI” and cause transient infected throughout the herd. Cattle can not become PI-they must be born with it. Transient infected will recover after removal of “PI”

What does a “PI” do to the herd?