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To assess persistence of anti-HBs and immunologic memory of non-responders after revaccination, 40 healthy non-responder children were given a three-dose recombinant hepatitis B vaccine revaccination randomly by intramuscular (10μg per dose) or intradermal (2μg per dose) route and followed up to five years. All 17 intramuscular and 22 of 23 intradermal children developed a seroprotective antibody...
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