Epidemiological characteristics of breakthrough varicella cases among students in Jiulongpo District, Chongqing: implications for vaccination strategies

The rising incidence of varicella breakthrough infections necessitates transitioning to a two-dose regimen. To reduce the risk of breakthrough infections in student populations, we recommend timely administration of the first varicella vaccine dose at 12 months of age, followed by a second booster dose as early as possible.