Effects of Varicella Vaccine Time of First Dose and Coverage of Second Dose - Beijing and Ningbo, China, 2012-2018.

WHAT IS ALREADY KNOWN ABOUT THIS TOPIC?: The effectiveness of the two-dose vaccination schedule of varicella is better than that of one dose, but the vaccination schedule and coverage of varicella varies based on provinces in the mainland of China and has differing effects.

WHAT IS ADDED BY THIS REPORT?: Earlier vaccination of the first dose may reduce the varicella incidence, and improving the vaccination coverage rates of the second dose will further reduce the varicella incidence.

WHAT ARE THE IMPLICATIONS FOR PUBLIC HEALTH PRACTICE?: Taking the first dose of vaccination promptly at 12 months old and improving the coverage of second dose of vaccination may play an important role in varicella prevention and control in China.