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Varicella vaccine (VarV) is recommended as effective post-exposure prophylaxis (PEP) within 3–5days to control outbreaks. However, the effectiveness of PEP at >5days after exposure and the administration of a second dose to those with a history of one dose prior to exposure have not been fully examined. This study evaluated the vaccine effectiveness (VE) of PEP in preventing disease during a varicella...
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