A man receives a booster dose of the coronavirus disease (COVID-19) vaccine at the vaccine center in Espoo, Finland, January 4, 2022. Lehtikuva/Jussi Nukari/via REUTERS ATTENTION EDITORS – THIS IMAGE WAS PROVIDED BY A THIRD PARTY. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. FINLAND OUT. NO COMMERCIAL OR EDITORIAL SALES IN FINLAND.

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. REUTERS/Carlo Allegri

People line up at a COVID-19 testing site as the Omicron variant of the coronavirus continues to spread through the country in Houston, Texas, U.S., December 30, 2021. REUTERS/Callaghan O’Hare

FILE PHOTO: Travelers wearing protective face masks to prevent the spread of the coronavirus disease (COVID-19) reclaim their luggage at the airport in Denver, Colorado, U.S., November 24, 2020. REUTERS/Kevin Mohatt/File Photo