People line up to receive a booster dose of the AstraZeneca coronavirus disease (COVID-19) vaccine, in Santa Catarina, on the outskirts of Monterrey, Mexico January 19, 2022.

A health worker collects a swab sample from a woman to test for the coronavirus disease (COVID-19), after cases of the Omicron variant were detected in Porto Alegre, Brazil, January 20, 2022.

People queue to receive a booster dose of the AstraZeneca coronavirus disease (COVID-19) vaccine, in Santa Catarina, on the outskirts of Monterrey, Mexico January 19, 2022.

A man receives a booster dose of the AstraZeneca coronavirus disease (COVID-19) vaccine, in Santa Catarina, on the outskirts of Monterrey, Mexico January 19, 2022.

Luan Ribeiro Ferreira dos Santos receives a dose of Sinovac Biotech's Coronavac vaccine against the coronavirus disease (COVID-19), as the National Health Surveillance Agency (ANVISA) approved its use for children, in Sao Paulo, Brazil, January 20, 2022.

A woman reacts as she receives a booster shot vaccine against coronavirus disease (COVID-19), at a medical clinic makeshift tent to enhance the booster programme in Nairobi, Kenya, January 19, 2022.

Erico Amorim de Souza Nunes receives a dose of Sinovac Biotech's Coronavac vaccine against the coronavirus disease (COVID-19), as the National Health Surveillance Agency (ANVISA) approved its use for children, in Sao Paulo, Brazil, January 20, 2022.

A health worker prepares a sample of test for the coronavirus disease (COVID-19), after cases of the Omicron variant were detected in Porto Alegre, Brazil, January 20, 2022.

People queue to be tested for the coronavirus disease (COVID-19) as the pandemic continues in Mexico City, Mexico, January 20, 2022.

A health worker prepares a sample of test for the coronavirus disease (COVID-19), after cases of the Omicron variant were detected in Porto Alegre, Brazil, January 20, 2022.

People wait at a rapid testing site during a mass testing for the coronavirus disease (COVID-19), after cases of the Omicron variant were detected in Porto Alegre, Brazil, January 20, 2022.

People walk past a COVID-19 testing sign during the coronavirus disease (COVID-19) pandemic in the Manhattan borough of New York City, New York, U.S., January 20, 2022.

People queue as they register to be tested for the coronavirus disease (COVID-19) as the pandemic continues in Mexico City, Mexico, January 20, 2022. Image used for illustrative purpose.

Judith Johanna Pawelke processes a coronavirus disease (COVID-19) test in her interior design store, which is currently being used as a COVID-19 test station in downtown Munich, Germany, January 19, 2022.

People queue outside a gym set up as a Respiratory Care Module where workers of the Mexican Social Security Institute (IMSS) grant sick leaves to patients with the coronavirus disease (COVID-19) in Ciudad Juarez, Mexico, January 19, 2022.

A woman registers to be tested for the coronavirus disease (COVID-19) as the pandemic continues in Mexico City, Mexico, January 20, 2022.

Judith Johanna Pawelke processes a coronavirus disease (COVID-19) test in her interior design store, which is currently being used as a COVID-19 test station in downtown Munich, Germany, January 19, 2022.

A health worker collects a swab sample from a woman to test for the coronavirus disease (COVID-19), after cases of the Omicron variant were detected in Porto Alegre, Brazil, January 20, 2022.