A volunteer adjusts an oxygen cylinder, to be delivered to people who suffer from the coronavirus disease (COVID-19) and receive home care, in Damascus, Syria March 3, 2021. Picture taken March 3, 2021. REUTERS/Firas Makdesi

A volunteer adjusts an oxygen cylinder, to be delivered to people who suffer from the coronavirus disease (COVID-19) and receive home care, in Damascus, Syria March 3, 2021. Picture taken March 3, 2021. REUTERS/Firas Makdesi

A volunteer carries an oxygen cylinder, to be delivered to a patient suffering from the coronavirus disease (COVID-19) and receiving home care, in Damascus, Syria March 3, 2021. Picture taken March 3, 2021. REUTERS/Firas Makdesi

People queue to fill liquefied petroleum gas (LPG) cylinders at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

A person moves a cylinder of liquefied petroleum gas (LPG) after filling it at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

A person waits to fill a cylinder of liquefied petroleum gas (LPG) at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

People queue to fill liquefied petroleum gas (LPG) cylinders at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

People queue to fill Liquefied Petroleum Gas (LPG) cylinders at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

People queue to fill Liquefied Petroleum Gas (LPG) cylinders at a gas distribution center during a cold front in Ciudad Juarez, Mexico February 16, 2021. REUTERS/Jose Luis Gonzalez

An Egyptian man places an oxygen cylinder on top of his car for his relatives infected with the coronavirus disease (COVID-19), in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

People wait for oxygen cylinders amid the coronavirus disease (COVID-19) outbreak in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

People wait for oxygen cylinders amid the coronavirus disease (COVID-19) outbreak in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

People wait for oxygen cylinders amid the coronavirus disease (COVID-19) outbreak in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

People wait for oxygen cylinders amid the coronavirus disease (COVID-19) outbreak in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

An Egyptian man carries an oxygen cylinder for his relatives infected with the coronavirus disease (COVID-19), in Cairo, Egypt February 2, 2021. REUTERS/Amr Abdallah Dalsh

Declan Eugene, a supplier of medical oxygen, moves cylinders during interview with Reuters, amid the coronavirus disease (COVID-19) in Abuja, Nigeria January 20, 2021. Picture taken January 20, 2021. REUTERS/Afolabi Sotunde

Robert Gosling places a cylinder of Stilton cheese onto a shelf in the chiller room at Hartington Creamery near Matlock, Britain, January 28, 2021. REUTERS/Phil Noble

Robert Gosling places a cylinder of Stilton cheese onto a shelf in the chiller room at Hartington Creamery near Matlock, Britain, January 28, 2021. REUTERS/Phil Noble

A man waits to leave an oxygen cylinder, used by patients suffering from the coronavirus disease (COVID-19) and receiving home care, with the SOS AM Group for recharging, in Manaus, Brazil, January 31, 2021. Picture taken January 31, 2021. REUTERS/Bruno Kelly

A volunteer of the SOS AM Group carries an oxygen cylinder that needs recharging before being delivered to patients who suffer from the coronavirus disease (COVID-19) and receive health care at home, in Manaus, Brazil, January 31, 2021. Picture taken January 31, 2021. REUTERS/Bruno Kelly

Residents leave oxygen cylinders used by patients, who suffer from the coronavirus disease (COVID-19) and receive home care, with the SOS AM Group for recharging, in Manaus, Brazil, January 31, 2021. Picture taken January 31, 2021. REUTERS/Bruno Kelly

A volunteer at the SOS AM Group disinfects oxygen cylinders used by patients, who suffer from the coronavirus disease (COVID-19) and receive home care, in Manaus, Brazil, January 31, 2021. Picture taken January 31, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

A person reacts as relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

A woman reacts as relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, who are mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 18, 2021. REUTERS/Bruno Kelly

A man sleeps inside his car as him and other relatives of patients hospitalised or receiving healthcare at home, mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 16, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 16, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 16, 2021. REUTERS/Bruno Kelly

A man sleeps inside his car as him and other relatives of patients hospitalised or receiving healthcare at home, mostly suffering from the coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 16, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering from coronavirus disease (COVID-19), gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

Felipe Belmonde, 30, waits outside a private company to buy oxygen and fill a cylinder for his mother-in-law who is receiving healthcare at home suffering of coronavirus disease (COVID-19) in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

A health worker holds an oxygen cylinder while transporting COVID-19 patients to a Brazilian Air Force airplane before being moved to Maranhao state, amid the coronavirus disease (COVID-19) outbreak in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

A man carries an oxygen cylinder as relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy it from a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, carry cylinders as they buy oxygen from a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, queue to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, queue to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, queue to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

A man carries a cylinder as relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy oxygen at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly

Relatives of patients hospitalised or receiving healthcare at home, mostly suffering of COVID-19, gather to buy oxygen and fill cylinders at a private company in Manaus, Brazil January 15, 2021. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

A worker arrives with an oxygen cylinder at Getulio Vargas hospital, amid the coronavirus disease (COVID-19) outbreak in Manaus, Brazil January 14, 2021. REUTERS/Bruno Kelly

A municipal healthcare worker walks past an oxygen cylinder as he arrives to examine the body of Anselmo Chagas Cardoso, who died at home at the age of 71 after reporting symptoms consistent with COVID-19, amid the coronavirus disease (COVID-19) outbreak, in Manaus, Brazil, January 12, 2021. REUTERS/Bruno Kelly

People stand next to oxygen cylinders, donated by Egyptian soccer player Mohamed Salah to his hometown to help in the fight against the coronavirus disease (COVID-19) pandemic, in Nagrig, Egypt January 11, 2021. Picture taken January 11, 2021. REUTERS/Ahmed Fahmy

Oxygen cylinders, donated by Egyptian soccer player Mohamed Salah to his hometown to help in the fight against the coronavirus disease (COVID-19) pandemic, are seen near a banner depicting him, in Nagrig, Egypt January 11, 2021. Picture taken January 11, 2021. REUTERS/Ahmed Fahmy

A worker pushes a trolley with the oxygen cylinders as ambulances queue at the Royal London Hospital amidst the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, January 9, 2021. REUTERS/Simon Dawson

A worker unload oxygen cylinders at the Vologda City Hospital Number 1, where patients suffering from the coronavirus disease (COVID-19) are treated, in Vologda, Russia November 24, 2020. REUTERS/Anton Vaganov

Oxygen cylinders are pictured at the Vologda City Hospital Number 1, where patients suffering from the coronavirus disease (COVID-19) are treated, in Vologda, Ru ssia November 24, 2020. REUTERS/Anton Vaganov

A Belgian military personnel member wears a full protective suit during the disinfection of an ambulance's oxygen cylinder amid the coronavirus disease (COVID-19) outbreak in Brussels, Belgium November 13, 2020. REUTERS/Johanna Geron