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2003 SEP 10 - (NewsRx.com & NewsRx.net) -- Delayed hepatitis A booster is still effective in people older than two years.
"Current immunization schedules for hepatitis A vaccine specify administration of a booster within 6-12 or 6-18 months of the primary dose. However, there may be circumstances that disrupt this schedule and the efficacy of administering a booster beyond the recommended time is a practical concern for healthcare providers," investigators in the United States report.
"In this study, a booster was administered to 268 participants (137:
The investigators concluded, "Findings suggest a booster administered 20-31 months after the primary dose is immunogenic and GMT in persons >2 years of age were comparable to those seen in adults and children who receive hepatitis A vaccine per schedule."
Williams and his colleagues published their study in Vaccine (Hepatitis A vaccine: immunogenicity following administration of a delayed immunization schedule in infants, children and adults. Vaccine, 2003;21(23):3208-3211).
For additional information, contact James L. ...
Source: HighBeam Research, Delayed hepatitis A booster still effective in people older than 2...