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 TPX IMAGES OF THE DAY 

A woman holds a test kit as she waits 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 

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 

Indigenous child Stevon Tataendy, 8, reacts after receiving a dose of the Pfizer-BioNTech coronavirus disease (COVID-19) paediatric vaccine in Sao Paulo, Brazil, January 17, 2022. REUTERS/Carla Carniel REFILE - CORRECTING YEAR 

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 (COVID-19) pandemic continues in Beijing, China, January 17, 2022. REUTERS/Thomas Peter 

Medical workers administer nasal swabs to patients at a coronavirus disease (COVID-19) testing centre in Saint-Hilaire-de-Loulay near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe 

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 

Man 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 staff gives orders while people receive booster shot of the coronavirus disease (COVID-19) vaccine at a square, in Taipei, Taiwan, January 17, 2022.REUTERS/Ann Wang 

Indigenous child Marcella Mirim, 9, receives a dose of the Pfizer-BioNTech coronavirus disease (COVID-19) paediatric vaccine in Sao Paulo, Brazil, January 17, 2022. REUTERS/Carla Carniel REFILE - CORRECTING YEAR 

A family rests as they 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 

A woman is tested for the coronavirus disease (COVID-19) at El Salvador del Mundo Square in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas 

A laboratory worker sorts samples for PCR tests at the Bioscientia laboratories headquarters as the spread of the coronavirus disease (COVID-19) continues in Ingelheim, Germany, January 17, 2022. REUTERS/Kai Pfaffenbach 

A laboratory worker prepares samples for PCR tests at the Bioscientia laboratories headquarters as the spread of the coronavirus disease (COVID-19) continues 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 in Saint-Hilaire-de-Loulay 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 near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe 

A woman reacts as she is tested for the coronavirus disease (COVID-19) at El Salvador del Mundo Square 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 outside a hospital following the coronavirus disease (COVID-19) outbreak in Beijing, China January 17, 2022. REUTERS/Carlos Garcia Rawlins 

A woman is tested for the coronavirus disease (COVID-19) at El Salvador del Mundo Square in San Salvador, El Salvador, January 17, 2022. REUTERS/Jose Cabezas 

Medical workers administer nasal swabs to patients at a coronavirus disease (COVID-19) testing centre in Saint-Hilaire-de-Loulay near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe 

A general view shows the PCR test facilities at the Bioscientia laboratories headquarters as the spread of the coronavirus disease (COVID-19) continues in Ingelheim, Germany, January 17, 2022. REUTERS/Kai Pfaffenbach 

A mother administers a COVID-19 saliva test to her child as people stand in a queue at a coronavirus disease (COVID-19) testing centre in Saint-Hilaire-de-Loulay near Nantes, France, January 17, 2022. REUTERS/Stephane Mahe 

A woman receives a booster shot of the coronavirus disease (COVID-19) vaccine at a community center, in Taipei, Taiwan, January 17, 2022.REUTERS/Ann Wang 

A woman receives a throat swab test as the coronavirus disease (COVID-19) pandemic continues in Beijing, China, January 17, 2022. REUTERS/Thomas Peter