Previous reports had indicated that there might be shortage or delay in vaccine supply due to a manufacturing problem. During the 1999-2000 flu season, approximately 74 million doses of influenza vaccine were distributed in the US, which was the largest ever reported and an increase of 11 million doses over the previous season.
Experts say the vaccine release schedule is about one month behind the normal schedule.
As a result, the committee has recommended delaying the mass vaccination campaign that usually begins in October and runs through December. The vaccine takes two weeks to become effective. Therefore, officials say vaccination as late as December would still provide effective protection from the upcoming flu season that typically begins in January or February. Officials say initial priority for flu shots should be given to individuals who are at increased risk for complications from influenza. Children and teenagers on long-term aspirin therapy, who may be at risk for developing Reye Syndrome after influenza infection.