BEIJING : China will begin its COVID-19 inoculation programme by first vaccinating some key priority groups, including those involved in medical treatment and disease control, within the winter-spring period, before starting a mass roll out, the National Health Commission (NHC) said on Saturday.The vaccination programme will also cover those who plan to work or study in counties and regions with medium or high risks of exposure to the virus, Cui Gang, an official with NHC's disease control department, told reporters.This will help relieve the pressure on China in preventing and controlling imported COVID-19 cases, and lower the risks of domestic outbreaks of the epidemic, the official said.In a two-step vaccination drive, the vaccines will.