MERCK's VARIVAX APPROVAL RECOMMENDATION INCLUDES CONCERN ABOUT LONG-TERM EFFICACY; CDC IS PLANNING SURVEILLANCE ONCE INCIDENCE OF CHICKEN POX DECLINES
Merck's Varivax chicken pox vaccine has unquestionable short- term efficacy, but the long-term efficacy of the varicella vaccine remains unclear, FDA's Vaccines & Related Biological Products Advisory Committee concluded at its Jan. 27 meeting.
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