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2004 MAR 3 - (NewsRx.com & NewsRx.net) -- About 4,300 babies born at University Hospital in Denver, Colorado, in the past 2 years need to get the hepatitis B vaccine again because their first shot may have been defective.
The vaccine may have frozen in storage, which could have reduced its effectiveness, hospital spokeswoman Sarah Ellis said February 9, 2004.
Ellis said there is no evidence the vaccine was ineffective, but "we just can't assume they're all OK."
The parents will be notified by letter.
Parents will not be charged for revaccination. The cost to the publicly funded hospital could exceed $300,000 because the vaccine costs $75 a shot.
The vaccine is usually given in a series of three shots. Babies who have had more than two additional shots probably do not need to be revaccinated, said William Letson, MD, a pediatric epidemiologist at the Colorado Department of Public Health and Environment.
However, an extra shot will not harm a child, he said.