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(Science: drug) A live-varicella virus vaccine. Limited clinical trials suggest the immunity lasts for at least six years.

The only significant adverse reaction detected in clinical studies was pain and redness at the injection site. Children (or adults) with a history for an anaphylactoid reaction to neomycin or gelatin or the presence of any febrile illness, should not be given the vaccine. Pregnant women and those who are immunocompromised should also not receive the vaccine. It is furthermore recommended that pregnancy be avoided for 3 months following vaccination.

In trials involving 9,000 children, 80% were protected and 20% reported mild cases.