A woman rubs her arm after receiving a coronavirus disease (COVID-19) vaccine at a vaccination centre in Karachi, Pakistan, January 4, 2022.

Passengers wearing protective masks stand inside a commuter train during the afternoon rush hours as the Omicron variant continues to spread, amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia, January 3, 2022.

People wearing protective face masks walk through Waterloo train station, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, January 3, 2022.

People line up for a COVID-19 test at a hospital, during the coronavirus disease (COVID-19) pandemic in the Bronx borough of New York City, New York, U.S., January 3, 2022.

Visitors wearing protective face masks wait to offer prayers on the first business day of the New Year at the Kanda Myojin shrine, frequented by worshippers seeking good fortune and prosperous business, amid the coronavirus disease (COVID-19) outbreak, in Tokyo, Japan, January 4, 2022.

People stand in line to receive the vaccine against the coronavirus disease (COVID-19) as the country has stepped up proof of vaccine requirements, in La Paz, Bolivia, January 3, 2022.

A pharmacy displays a sign notifying customers that there are no antigen tests in stock, amid the spread of the coronavirus disease (COVID-19) pandemic, in Galway, Ireland, January 4, 2022.

A sign is pictured outside a closed school after the City of Newark ordered students to return to remote instruction due to the spread of coronavirus disease (COVID-19) in Newark, New Jersey, U.S., January 4, 2022.

People wait in line to be tested for the coronavirus disease (COVID-19) amid a spike in the cases, outside the Hospital Pirovano, in Buenos Aires, Argentina January 4, 2022.

People line up in Times Square for a COVID-19 test during the coronavirus disease (COVID-19) pandemic in the Manhattan borough of New York City, New York, U.S., January 4, 2022.

Healthcare workers in personal protective equipment (PPE) take swab samples from people for a rapid antigen test amid the coronavirus disease (COVID-19) outbreak, in Athens, Greece, January 3, 2022.

Hindu devotees attend a religious gathering during the ongoing coronavirus disease (COVID-19) pandemic, in Ahmedabad, India, January 3, 2022. REUTERS/Amit Dave

Students leave a school after returning to in-person classes after the holiday break, as the coronavirus disease (COVID-19) pandemic continues in Mexico City, Mexico January 3, 2022.

Ambulance crew members walk through the ambulance bay after delivering a patient to Mount Sinai Hospital as officials warned of a "tsunami" of new coronavirus disease (COVID-19) cases in the days and weeks ahead due to the Omicron variant in Toronto, Ontario, Canada January 3, 2022.

A woman looks as police officers check proof of vaccination before people are allowed to enter the municipality, amid a spike in infections of the coronavirus disease (COVID-19), in El Alto, Bolivia, January 3, 2022.

People wearing protective masks walk on a street, following new cases of the coronavirus disease (COVID-19), in Shanghai, China January 4, 2022.

A person wearing a protective face mask is seen reflected in a store window, amid the coronavirus disease (COVID-19) outbreak, in St Albans, Britain, January 4, 2022. Image used for illustrative purpose.

People wearing protective face masks make their way next to the Parthenon temple atop the Acropolis hill, amid the coronavirus disease (COVID-19) pandemic in Athens, Greece, January 4, 2022.

People queue for COVID-19 tests in front of a laboratory in Paris amid the spread of the coronavirus disease (COVID-19) pandemic in France, January 4, 2022.