Effects of One-dose Varicella Vaccination on Disease Severity in Children during Outbreaks in Seoul, Korea

In Korea, the incidence of varicella has increased despite the introduction of a universal one-dose vaccination for children aged 12-15 months in 2005. A previous study demonstrated that the vaccine effectiveness was insufficient to prevent against varicella. We assessed the effect of the varicella vaccination on disease severity.Epidemiologic investigation of varicella cases in Seoul metropolitan area from 2015 to 2017 were used....