Nearly a million doses of swine flu vaccine for infants may have been slightly less potent than required but should work anyway, federal officials said in announcing a recall of the shots. The maker of the vaccine, Sanofi-Aventis, voluntarily recalled 800,000 doses of low-dose, thimerosal-free vaccine in prefilled syringes intended for infants ages 6 months to 35 months. Since most of the vaccine was released a month ago, it presumably has already been used, but the recall is intended to alert doctors to return any supplies they have left, the New York Times reports.
