A nurse prepares to administer the COVID-19 vaccine in Ankara, Turkey on Feb. 27, 2021. The country started mass COVID-19 vaccination on Jan. 14 after the authorities approved the emergency use of the Chinese CoronaVac vaccine. More than 6,865,000 people have been vaccinated so far. (Photo by Mustafa Kaya/Xinhua)

A person receives the COVID-19 vaccine in Ankara, Turkey on Feb. 27, 2021. The country started mass COVID-19 vaccination on Jan. 14 after the authorities approved the emergency use of the Chinese CoronaVac vaccine. More than 6,865,000 people have been vaccinated so far. (Photo by Mustafa Kaya/Xinhua)

A nurse shows the CoronaVac COVID-19 vaccine in Ankara, Turkey on Feb. 27, 2021. The country started mass COVID-19 vaccination on Jan. 14 after the authorities approved the emergency use of the Chinese CoronaVac vaccine. More than 6,865,000 people have been vaccinated so far. (Photo by Mustafa Kaya/Xinhua)