RT @MiriamETucker: In study of 22,439 adults 50-59 years with prior varicella but not zoster, Zostavax efficacy was 69.8%. #ACIP #vaccine
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RT @MiriamETucker: In study of 22,439 adults 50-59 years with prior varicella but not zoster, Zostavax efficacy was 69.8%. #ACIP #vaccine