Attenuated vaccine

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According to the Centers for Disease Control and Prevention, an attenuated vaccine is "a vaccine in which live virus is weakened through chemical or physical processes in order to produce an immune response without causing the severe effects of the disease."

"Attenuated vaccines currently licensed in the United States include measles, mumps, rubella, polio, yellow fever and varicella."

"[An attenuated vaccine is] also known as a live vaccine."[1]