RT @MiriamETucker: Pfizer's Dr. Gruber: Prevnar 13 contains pneumo strain 19A, which is the most prevalent cause of invasive pneumo in U.S.
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RT @MiriamETucker: Pfizer's Dr. Gruber: Prevnar 13 contains pneumo strain 19A, which is the most prevalent cause of invasive pneumo in U.S.