1. 
   vaccines, attenuated
   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. .....
   Found op http://www.mondofacto.com/facts/dictionary?vaccines,+attenuated
   
   

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