Herd immunity occurs when enough of the population has immunity, either from vaccination or past infection, to stop the uncontrolled spread of an infectious disease like COVID-19. China had administered 52.5 million vaccine doses through the end of February. It has been slower in its vaccination campaign than many other countries, including the U.S., government health experts have acknowledged. China has committed roughly 10 times more doses abroad than it has distributed at home.
Although emergency vaccinations have been underway in China since at least last summer, the country has been slow to announce whether it had any plans to achieve herd immunity. China currently has 17 COVID-19 vaccine candidates for clinical trials.