Hey, Doc, why do my calves still get sick after I vaccinate them?
Several factors can limit vaccine effectiveness. Some of the most common we see are:
- Not vaccinating all susceptible animals
- Not following manufacturer's labeled recommendations
- Not vaccinating incoming animals
- Vaccinating too young (interfere's with maternal antibodies)
- Vaccinating stressed animals
- Vaccinating in the face of a disease outbreak
- Vaccinating too late relative to an anticipated exposure or stress
- Failing to administer a booster when needed
- Inappropriate vaccine choice
- Improper vaccine handling - especially in vaccines purchased over-the counter