The Food and Drug Administration on Wednesday approved Pfizer's vaccine against the respiratory syncytial virus, or R.S.V., for adults age 60 and older, the second approval granted for shots offering protection from the virus this month.GSK was the first drugmaker to get the F.D.A.'s permission to market an R.S.V. vaccine on May 3. The vaccines are expected to be available in the fall before the winter R.S.V. season.
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