"It's a problem of potency not safety," said Marcus Cheatham, assistant deputy health officer with the Ingham County Health Department.
Still, officials don't believe any child who received a recalled vaccine will need a replacement dose. Youngsters are already supposed to be receiving two doses spaced about a month apart, so health officials believe children will ultimately receive enough protection from the H1N1 virus, which causes swine flu.
The low-potency vaccine doses are part of a national recall of about 800,000 doses made by Sanofi Pasteur, which is headquartered in France. The doses are pre-filled syringes intended for very young children.
Officials from the federal Centers for Disease Control and Prevention in Atlanta are adamant that children who received the recalled vaccine don't need to be re-vaccinated.
"The potency level did not drop to levels that would result in people not being protected," said CDC spokesman Tom Skinner.
The vaccine met standards when it was shipped; over time it has lost some effectiveness.
Federal officials were notified Dec. 7 that Sanofi discovered the problem in four lots of the 0.25 milliliter pre-filled pediatric syringes.
Unused vaccine is being returned to Sanofi
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