Dr. Dennis O'Mara, an associate director at the Centers for Disease Control and Prevention's National Immunization Program, says that the number of flu vaccine doses produced in 2003 will be between 84.5 million and 91 million. While the supply will be less than the number of doses produced in recent years, O'Mara says a shortage is not predicted. The U.S. Food and Drug Administration has suggested that any flu vaccine include preventive measures against the three strains: A New Caledonia, A Moscow, and B Hong Kong. Specific recommendations will soon be formulated by the Advisory Committee on Immunization Practices.