A patient receives medical treatment in the coronavirus disease (COVID-19) ward of a hospital in Yaremche in Ivano-Frankivsk Region, Ukraine March 3, 2021. REUTERS/Anastasia Vlasova

Patients receive medical treatment in the coronavirus disease (COVID-19) ward of a hospital in Yaremche in Ivano-Frankivsk Region, Ukraine March 3, 2021. REUTERS/Anastasia Vlasova

A patient receives medical treatment in the coronavirus disease (COVID-19) ward of a hospital in Yaremche in Ivano-Frankivsk Region, Ukraine March 3, 2021. REUTERS/Anastasia Vlasova

A patient receives medical treatment in the coronavirus disease (COVID-19) ward of a hospital in Yaremche in Ivano-Frankivsk Region, Ukraine March 3, 2021. REUTERS/Anastasia Vlasova

Malnourished girl Ahmadiya Juaidi, 13, holds cups of supplemental nutrition shake she received at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. Picture taken February 24, 2021. REUTERS/Khaled Abdullah

Malnourished girl Ahmadiya Juaidi, 13, drinks a supplemental nutrition shake at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. Picture taken February 24, 2021. REUTERS/Khaled Abdullah

Malnourished girl Ahmadiya Juaidi, 13, waits to receive a supplemental nutrition shake at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. Picture taken February 24, 2021. REUTERS/Khaled Abdullah

Ahmadiya Juaidi, 13, drinks a supplemental nutrition shake at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. REUTERS/Khaled Abdullah TPX IMAGES OF THE DAY

Women wait to receive supplemental nutrition shakes, at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. REUTERS/Khaled Abdullah

A child cries at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. REUTERS/Khaled Abdullah

Ahmadiya Juaidi, 13, looks on as she stands at the door of her room at malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 24, 2021. REUTERS/Khaled Abdullah

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

Patients recovering from the coronavirus disease (COVID-19) are treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A healthcare worker treats a patient recovering from the coronavirus disease (COVID-19) at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A healthcare worker treats a patient recovering from the coronavirus disease (COVID-19) at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini

A labourer stands on a portable lift as he injects a type of grout into gaps and fissures in the stones of the Western Wall, Judaism's holiest prayer site, as part of the Israel Antiquities Authority treatment of the ancient stones, in Jerusalem's Old City February 23, 2021. REUTERS/Ilan Rosenberg

A labourer stands on a portable lift as he injects a type of grout into the gaps and fissures in the stones of the Western Wall, Judaism's holiest prayer site, as part of the Israel Antiquities Authority treatment of the ancient stones, in Jerusalem's Old City February 23, 2021. REUTERS/Ronen Zvulun

A labourer stands on a portable lift as he injects a type of grout into the gaps and fissures in the stones of the Western Wall, Judaism's holiest prayer site, as part of the Israel Antiquities Authority treatment of the ancient stones, in Jerusalem's Old City February 23, 2021. REUTERS/Ronen Zvulun

A labourer injects a type of grout into the gaps and fissures in the stones of the Western Wall, Judaism's holiest prayer site, as part of the Israel Antiquities Authority treatment of the ancient stones, in Jerusalem's Old City February 23, 2021. REUTERS/Ronen Zvulun

Rugby Union - Premiership - Bath Rugby v Gloucester Rugby - Recreation Ground, Bath, Britain - February 19, 2021 Gloucester's Kyle Moyle receives medical treatment Action Images/Andrew Boyers

Almost 12 million residents in over 100 counties have been told to boil their drinking water after water-treatment plants lost power, which could allow harmful bacteria to proliferate.

Umer Jan, 12 takes part in a rally to encourage Canada and other countries as they consider labeling China's treatment of its Uighur population and Muslim minorities as genocide, outside the Canadian Embassy in Washington, D.C., U.S. February 19, 2021. REUTERS/Leah Millis

Jamal Rehi chants with others during a rally to encourage Canada and other countries as they consider labeling China's treatment of its Uighur population and Muslim minorities as genocide, outside the Canadian Embassy in Washington, D.C., U.S. February 19, 2021. REUTERS/Leah Millis

Geofrey Twesigye, a cameraman working with NTV receives treatment at a hospital after he was injured following an attack by security officials, outside the United Nations Human Rights offices while on reporting duty, in Kampala, Uganda February 17, 2021. REUTERS/Abubaker Lubowa

Rashidah Nakayi, a journalist working with Galaxy FM receives treatment at a hospital after she was injured following an attack by security officials, outside the United Nations Human Rights offices while on reporting duty, in Kampala, Uganda February 17, 2021. REUTERS/Abubaker Lubowa

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 16, 2021 Bulgaria's Grigor Dimitrov speaks to the medical staff before leaving the court to receive treatment during his quarter final match against Russia's Aslan Karatsev REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 16, 2021 Bulgaria's Grigor Dimitrov speaks to the medical staff before leaving the court to receive treatment during his quarter final match against Russia's Aslan Karatsev REUTERS/Kelly Defina

Mother of Radhi Awadh, 2, a malnourished boy, holds him at a malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 13, 2021. REUTERS/Khaled Abdullah

Radhi Awadh, 2, a malnourished boy cries as his mother holds him at a malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 13, 2021. REUTERS/Khaled Abdullah

Radhi Awadh, 2, a malnourished boy cries as his mother holds him at a malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 13, 2021. REUTERS/Khaled Abdullah

Ahmadiya Juaidi, 13, a malnourished girl sits on a bed at a malnutrition treatment ward of al-Sabeen hospital in Sanaa, Yemen February 13, 2021. REUTERS/Khaled Abdullah

People attend a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

Aymara women from Los Andes Province attend a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

An Aymara woman holds herbs during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

A man passes through a disinfection chamber during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

Aymara people attend a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

Aymara people attend a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

An Aymara woman serves a potion of herbs during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

An Aymara witchdoctor holds a potion of herbs during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

Aymara witchdoctors attend a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

A man passes through a disinfection chamber during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

An Aymara witchdoctor holds a potion of herbs during a traditional medicine fair with treatments for the coronavirus disease (COVID-19) in El Alto, outskirts of La Paz, Bolivia, February 6, 2021. REUTERS/David Mercado

A doctor is seen as patients receive medical treatment in a hospital for people infected with the coronavirus disease (COVID-19) in Kyiv, Ukraine January 26, 2021. Picture taken January 26, 2021. REUTERS/Gleb Garanich

Sergiy Dubrov, a head of the hospital's COVID-19 department, speaks with a patient who receives medical treatment in a hospital for people infected with the coronavirus disease (COVID-19) in Kyiv, Ukraine January 26, 2021. Picture taken January 26, 2021. REUTERS/Gleb Garanich

A doctor works as patients receive medical treatment in a hospital for people infected with the coronavirus disease (COVID-19) in Kyiv, Ukraine January 26, 2021. Picture taken January 26, 2021. REUTERS/Gleb Garanich

Sergiy Dubrov, a head of the hospital's COVID-19 department, is seen as patients receive medical treatment in a hospital for people infected with the coronavirus disease (COVID-19) in Kyiv, Ukraine January 26, 2021. Picture taken January 26, 2021. REUTERS/Gleb Garanich