The next-generation version of Pfizer's (PFE) $6 billion pneumococcal vaccine franchise topped its predecessor in a midstage study, the S&P 500 drug giant said Wednesday. Pfizer compared four doses of its new vaccine in infants to four doses of Prevnar 20 at months two, four, six and 12-15. Prevnar 20, as the name suggests, blocks 20 strains of a bacteria…

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