The push comes as the World Health Organisation also raised concerns that China's 1.4 billion population was not adequately vaccinated and the United States offered help in dealing with a surge in infections.
For all its efforts to quell the virus since it erupted in the central city of Wuhan in late 2019, China may now pay a price for shielding a population that lacks "herd immunity" and has low vaccination rates among the elderly, analysts said.
China has reported just 5,235 COVID-related deaths so far, extremely low by global standards
China, which has said around 90% of its population is vaccinated against COVID, has now decided to roll out the second booster shot for high-risk groups and elderly people over 60 years of age.
The latest official data shows China administered 1.43 million COVID shots on Tuesday, well above rates in November of around 100,000-200,000 doses a day. In total, it has administered 3.45 billion shots.
Beijing has been largely resistant to western vaccines and treatments, having relied on locally-made shots. Pfizer's (PFE.N) oral COVID-19 treatment Paxlovid is one of the few foreign ones it has approved.