A woman receives a throat swab test at a street booth as the coronavirus disease (COVID-19) pandemic continues in Beijing, China, January 17, 2022. REUTERS/Thomas Peter
A woman holds a test kit as she waits to be tested for the coronavirus disease (COVID-19) in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
People wait to be tested for the coronavirus disease in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
Indigenous child Stevon Tataendy, 8, reacts after receiving a dose of the coronavirus disease vaccine in Sao Paulo, Brazil, January 17, 2022. REUTERS/Carla Carniel
People wait to be tested for the coronavirus disease (COVID-19) at El Salvador del Mundo Square in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
Rubber gloves used to administer throat swab tests are seen at a street booth as the coronavirus disease pandemic continues in Beijing, China, January 17, 2022. REUTERS/Thomas Peter
Medical workers administer nasal swabs to patients at a coronavirus disease testing centre in Saint-Hilaire-de-Loulay, France, January 17, 2022. REUTERS/Stephane Mahe
People wait to be tested for the coronavirus disease at in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
Man receives a throat swab test at a street booth in Beijing, China, January 17, 2022. REUTERS/Thomas Peter
A staff gives orders while people receive booster shots of the coronavirus disease vaccine in Taipei, Taiwan, January 17, 2022.REUTERS/Ann Wang
Indigenous child Marcella Mirim, 9, receives a dose of the vaccine in Sao Paulo, Brazil, January 17, 2022. REUTERS/Carla Carniel
A woman is tested for the coronavirus disease in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
A laboratory worker sorts samples for PCR tests at the Bioscientia laboratories headquarters in Ingelheim, Germany, January 17, 2022. REUTERS/Kai Pfaffenbach
A laboratory worker prepares samples for PCR tests at the Bioscientia laboratories headquarters in Ingelheim, Germany, January 17, 2022. REUTERS/Kai Pfaffenbach
A medical worker administers a nasal swab to a patient at a coronavirus disease (COVID-19) testing centre near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe
A medical worker looks on at a coronavirus disease (COVID-19) testing centre in Saint-Hilaire-de-Loulay France, January 17, 2022. REUTERS/Stephane Mahe
A woman reacts as she is tested for the coronavirus disease in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
A medical worker takes a swab sample from a woman for nucleic acid testing at a testing site in Beijing, China January 17, 2022. REUTERS/Carlos Garcia Rawlins
A woman is tested for the coronavirus disease in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas
Medical workers administer nasal swabs to patients in Saint-Hilaire-de-Loulay near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe
A mother administers a COVID-19 saliva test to her child as people stand in a queue at a coronavirus testing centre in Saint-Hilaire-de-Loulay, France, January 17, 2022. REUTERS/Stephane Mahe
A woman receives a booster shot of the coronavirus disease vaccine at a community center, in Taipei, Taiwan, January 17, 2022.REUTERS/Ann Wang
A woman receives a throat swab test in Beijing, China, January 17, 2022. REUTERS/Thomas Peter