People stand in queues to refill oxygen in cylinders in New Delhi, India, Friday, April 23, 2021. Scores have died in hospitals in India???s capital amid suggestions that low oxygen supplies were to blame. Doctors have taken to social media to beg public authorities to get them refurbishments, and the government has mobilized to bring oxygen supplies by train, plan and truck. The demand for oxygen from hospitals has nearly tripled to 8,000 metric tons, the federal government told the Delhi High Court last week. India???s total production was 7,500 metric tons of oxygen per day. (AP Photo)

A COVID-19 patient breathes with the help of an oxygen mask as he waits inside an auto rickshaw to be attended to and admitted in a dedicated COVID-19 government hospital in Ahmedabad, India, Thursday, April 22, 2021. Indian authorities scrambled Saturday to get oxygen tanks to hospitals where COVID-19 patients were suffocating amid the world???s worst coronavirus surge, as the government came under increasing criticism for what doctors said was its negligence in the face of a foreseeable public health disaster. (AP Photo/Ajit Solanki)

Ambulances carrying COVID-19 patients line up waiting for their turn to be attended to at a dedicated COVID-19 government hospital in Ahmedabad, India, Thursday, April 22, 2021. Indian authorities scrambled Saturday to get oxygen tanks to hospitals where COVID-19 patients were suffocating amid the world???s worst coronavirus surge, as the government came under increasing criticism for what doctors said was its negligence in the face of a foreseeable public health disaster. (AP Photo/Ajit Solanki)

A COVID-19 patient lies inside a vehicle to be attended to and admitted in a dedicated COVID-19 government hospital in Ahmedabad, India, Thursday, April 22, 2021. India is putting oxygen tankers on special express trains as major hospitals in New Delhi begged on social media for more supplies to save COVID-19 patients who are struggling to breathe. Hospitals in New Delhi and some of the worst-hit states reported being critically short of beds and oxygen Saturday. (AP Photo/Ajit Solanki)

Multiple funeral pyres of victims of COVID-19 burn in a ground that has been converted into a crematorium for mass cremation, in New Delhi, India, Wednesday, April 21, 2021. India???s underfunded health system is tattering as the world???s worst coronavirus surge wears out the nation, which set a global record in daily infections for a second straight day with 332,730. (AP Photo)

FILE - In this April 21, 2021, file photo, security guard objects to taking taking pictures as hospital staff shift the body of a COVID-19 patient on a stretcher to a waiting ambulance at a government COVID-19 hospital in Noida, a suburb of New Delhi, India. India is battling the world???s fastest pace of spreading infections. Its government has blocked vaccine exports for several months to better meet needs at home, exacerbating the difficulty of poor countries to access vaccine. (AP Photo/Altaf Qadri, File)

A dead body waits to be cremated as multiple funeral pyres of those who died of COVID-19 burn at a ground that has been converted into a crematorium for mass cremation of coronavirus victims, in New Delhi, India, Wednesday, April 21, 2021. Delhi has been cremating so many bodies of coronavirus victims that authorities are getting requests to start cutting down trees in city parks, as a second record surge has brought India's tattered healthcare system to its knees.??(AP Photo)

FILE - In this April 20, 2021, file photo, notices informing about the shortage of COVID-19 vaccine is displayed on the gate of a vaccination centre in Mumbai, India. India is battling the world???s fastest pace of spreading infections. Its government has blocked vaccine exports for several months to better meet needs at home, exacerbating the difficulty of poor countries to access vaccine. (AP Photo/Rafiq Maqbool, File)

A COVID-19 patient breathes with the help of an oxygen mask and waits inside an auto rickshaw to be attended to and admitted to a dedicated COVID-19 government hospital in Ahmedabad, India, Saturday, April 17, 2021. Indian authorities scrambled Saturday to get oxygen tanks to hospitals where COVID-19 patients were suffocating amid the world???s worst coronavirus surge, as the government came under increasing criticism for what doctors said was its negligence in the face of a foreseeable public health disaster. (AP Photo/Ajit Solanki)

FILE - In this March 12, 2021, file photo, a woman waits to receives one of the country's first coronavirus vaccinations manufactured by the Serum Institute of India and provided through the global COVAX initiative, at Yaba Mainland hospital in Lagos, Nigeria. The stark vaccine access gap is prompting increased calls across the world for the U.S. to start shipping vaccine supplies to poorer countries. (AP Photo/Sunday Alamba, File)

FILE - In this March 4, 2021, file photo, empty boxes used for the transport of AstraZeneca COVID-19 vaccine manufactured by the Serum Institute of India, after the vaccines were put into refrigerated storage units in Kitengela town on the outskirts of Nairobi, in Kenya. The stark vaccine access gap is prompting increased calls across the world for the U.S. to start shipping vaccine supplies to poorer countries. (AP Photo/Ben Curtis, File)

(FILES) In this file photo taken on December 4, 2020, a Covid-19 positive patient is seen on a ventilator at UMass Memorial Hospital in Worcester, Massachusetts. - The United States will "immediately" make supplies of vaccine-production material, as well as therapeutics, tests, ventilators and protective equipment available to India as the South Asian giant battles a Covid-19 surge, the White House said on April 25, 2021. (Photo by allison dinner and Allison Dinner / AFP)

A view of the deserted old city during a weekend lockdown to curb the spread of coronavirus in Prayagraj, India, Saturday, April 24, 2021. Indian authorities are scrambling to get medical oxygen to hospitals where COVID-19 patients are suffocating from low supplies. The effort Saturday comes as the country with the world's worst coronavirus surge set a new global daily record of infections for the third straight day. The 346,786 infections over the past day brought India's total past 16 million.(AP Photo/Rajesh Kumar Singh)