Japanese Prime Minister Yoshihide Suga declares a state of emergency for Tokyo and three other prefectures during the government task force meeting for the COVID-19 measures at the prime minister's office in Tokyo, Japan April 23, 2021. Eugene Hoshiko/Pool via REUTERS

Volunteers wash food containers after the distribution of Iftar meals as part of the Wajba (meal) initiative to help the poor during the holy month of Ramadan in Sanaa, Yemen April 22, 2021. REUTERS/Nusaibah Aluaalemi

Empty Pfizer-BioNTech COVID-19 vaccine vials and syringes are seen in a disposal container at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

Empty Pfizer-BioNTech COVID-19 vaccine vials and syringes are seen in a disposal container at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

A health worker looks at an infusion bottle containing a monoclonal antibody treatment as it is being administered intravenously to a coronavirus disease (COVID-19) patient, at San Giuseppe Hospital, in Albano, Italy, April 22, 2021. REUTERS/Yara Nardi

A health worker looks at an infusion bottle containing a monoclonal antibody treatment as it is being administered intravenously to a coronavirus disease (COVID-19) patient, at San Giuseppe Hospital, in Albano, Italy, April 22, 2021. REUTERS/Yara Nardi

Instructor Philippe Boulanger talks to pilots as they steer a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, during a training course on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

A pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

A pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, during a training course on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Instructor Philippe Boulanger conducts a training course as a pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

Boxes containing vaccines against the coronavirus disease (COVID-19) are seen at Bab al-Hawa crossing at the Syrian-Turkish border, in Idlib governorate, Syria April 21, 2021. REUTERS/Khalil Ashawi

Healthcare workers stand next to boxes containing vaccines against the coronavirus disease (COVID-19) at Bab al-Hawa crossing at the Syrian-Turkish border, in Idlib governorate, Syria April 21, 2021. REUTERS/Khalil Ashawi

Citizen scientists use tweezers to remove microplastics from a sample to a separate container at Manly Cove Beach in Sydney, Australia, April 17, 2021. Picture taken April 17, 2021. REUTERS/James Redmayne

Australian Microplastic Assessment Project Research Director Dr Scott Wilson looks for microplastics amongst organic matter inside a container on Manly Cove Beach in Sydney, Australia, April 17, 2021. Picture taken April 17, 2021. REUTERS/James Redmayne

Microplastics and organic matter float in water inside a container at Manly Cove Beach in Sydney, Australia, April 17, 2021. Picture taken April 17, 2021. REUTERS/James Redmayne

Assorted microplastics are seen in a container at Macquarie University in Sydney, Australia, April 15, 2021. Picture taken April 15, 2021. REUTERS/Jill Gralow

A splice can that contains 432 fiber cables is pictured in Oldham county, Louisville, Kentucky, U.S., April 19, 2021. REUTERS/Amira Karaoud

Brazil's Sao Paulo state Governor, Joao Doria, receives a box of the China's Sinovac COVID-19 vaccine as containers with supplies to produce vaccines against the coronavirus disease (COVID-19) arrive at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli

Refrigerated containers with supplies to produce China's Sinovac vaccines against the coronavirus disease (COVID-19) arrive at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli

Brazil's Sao Paulo state Health Secretary Jean Gorinchteyn, Sao Paulo state Governor, Joao Doria and Dimas Tadeu Covas, director of Instituto Butantan hold boxes of the China's Sinovac vaccines near a refrigerated container with vaccines against the coronavirus disease (COVID-19), after its arrival at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. REUTERS/Amanda Perobelli

Refrigerated containers with supplies to produce China's Sinovac vaccines against the coronavirus disease (COVID-19) arrive at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli

A refrigerated container with supplies to produce China's Sinovac vaccines against the coronavirus disease (COVID-19) arrives at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli

Brazil's Sao Paulo state Health Secretary Jean Gorinchteyn, Sao Paulo state Governor, Joao Doria and Dimas Tadeu Covas, director of Instituto Butantan, hold boxes of the China's Sinovac vaccines near a refrigerated container with vaccines against the coronavirus disease (COVID-19) after its arrival at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. REUTERS/Amanda Perobelli

Refrigerated containers with supplies to produce China's Sinovac vaccines against the coronavirus disease (COVID-19) arrive at Sao Paulo International Airport in Guarulhos, Brazil April 19, 2021. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli

A resident sprays his property as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A person sprays water as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A resident sprays his property as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A person holds a fire hose as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A house is seen shrouded in smoke as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to c ontain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary frefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A resident sprays his property as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A resident sprays his property as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

A resident sprays his property as firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

Residents and voluntary firefighters battle to contain a fire fanned by strong winds on the slopes of Table Mountain in Cape Town, South Africa, April 19, 2021. REUTERS/Mike Hutchings

The historic Mostert's Mill smoulders as firefighters battle to contain a fire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

The historic Mostert's Mill smoulders as firefighters battle to contain a fire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

The historic Mostert's Mill smoulders as firefighters battle to contain a fire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

An aloe is seen amongst smoke as firefighters battle to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

A helicopter battles to contain a bushfire that broke out on the slopes of Table Mountain above the memorial to Cecil John Rhodes in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

Helicopters battle to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

A firefighter battles to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

Firefighters battle to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

Firefighters battle to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings

A firefighter battles to contain a bushfire that broke out on the slopes of Table Mountain in Cape Town, South Africa, April 18, 2021. REUTERS/Mike Hutchings