The validity period of China's COVID-19 vaccines remains to be determined. Current evidence suggests that the vaccines' protection period is more than half a year, which has met the requirements of the WHO. But lifelong immunity cannot be guaranteed for now. 

Hu Naijun, an associate professor at the University of the Chinese Academy of Sciences, School of Public Policy and Management, said we must rely on data and research to see the results, instead of making subjective predictions on the vaccine validity.