800,000 Doses of Swine Flu Vaccine Recalled for Lack of Potency

Vaccine manufacturer Sanofi-Aventis is recalling 800,000 doses of vaccine against the pandemic H1N1 virus meant for children younger than 3 because the vaccine has lost potency since it was shipped from the factory.

"This is non-safety related, but is part of a routine quality assurance program," Dr. Anne Schuchat, director of the Centers for Disease Control and Prevention's National Center for Immunization and Respiratory Diseases, said in a telephone interview. There are now 94.6 million doses of vaccine available, "so this is not as big a deal as it might have been earlier." She emphasized that "there are no safety concerns."

Sanofi-Aventis SA recalled 800,000 doses of swine flu vaccine after testing showed the potency of the batches was too low, the U.S. Centers for Disease Control and Prevention said today.

The shots are safe, and people who have already been inoculated don’t need to get vaccinated again, said Anne Schuchat, head of the CDC’s National Center for Immunization and Respiratory Diseases. Doctors who have unused shots from the batches should return them, she said today in a phone interview.