Vaccines, Attenuated

**Definition:** Live vaccines prepared from microorganisms which have undergone physical adaptation (e.g., by radiation or temperature conditioning) or serial passage in laboratory animal hosts or infected tissue/cell cultures, in order to produce avirulent mutant strains capable of inducing protective immunity.

**Tree numbers:** - D20.215.894.811

**Synonyms:** - Attenuated Vaccine - Vaccines, Live, Attenuated