Objective To analyze the epidemiological characteristics of varicella in Fenghua district of Ningbo, Zhejiang province, from 2013 to 2016, and identify the factors influencing the epidemic of varicella. Methods Descriptive epidemiological analysis was conducted in the incidence of varicella in Fenghua during 2013–2016. The incidence trend of varicella before and after 2 dose live attenuated varicella vaccine immunization program were compared. Results A total of1 198 varicella cases were reported with an av...