RT @MiriamETucker: Why is novel #H1N1 circ in summer (when most flu doesn't)? CDC's Dr. Cox: "We don't have an answer for that." #ACIP
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RT @MiriamETucker: Why is novel #H1N1 circ in summer (when most flu doesn't)? CDC's Dr. Cox: "We don't have an answer for that." #ACIP