COW VACCINES: DEAD OR ALIVE?

摘要

Vaccines for common viral cattle diseases such as respiratory infections or BVD come in two forms: killed vaccines and ” modified live vaccines.Killed vaccines don’t contain anylive material; they use a protein from the real virus to trigger an immune response. This response may be relatively mild, and a second booster shot is required. Modified live vaccines, however, contain an attenuated version of the live virus and actually replicate in the animal to mimic a real infection.