People at high risk of contracting COVID-19 are now permitted to get a second booster shot, according to a new notice on Wednesday.

It can be administered to those aged 60 and above who have received the first booster shot, and who have serious underlying conditions and low immunity, said the notice, which was released by the joint prevention and control mechanism of the State Council.

All vaccines with conditional approval for market use or emergency use can be used for the second booster and people are advised to get a different variety of vaccine for the second booster, which should be administered at least 6 months after the first booster.

Health authorities must make vaccine safety their top priority and ensure vaccinations are done in a standardized, safe way, the notice added.