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Countries around the world are accelerating deliveries of desperately needed medical supplies to India as the country endures an unrelenting, catastrophic second wave of coronavirus infections.

On Sunday, the United States delivered the third of six aid shipments to New Delhi, including 1,000 oxygen cylinders; Britain donated more than 400 oxygen concentrators; and France sent eight oxygen generators, each of which can serve 250 hospitalized patients.

Oxygen in India has been in short supply as it grapples with this latest wave of infections, leaving some dying COVID patients gasping for air in hospital beds. Others, unable to find room in overwhelmed health care centers, have died in hospital parking lots or at home.

On April 15, the health ministry said that India had a daily production capacity of about 7,700 tons of oxygen, some of which is used for industrial purposes, with 55,000 tons in reserve. A week later, a government official told the Delhi High Court that medical demand had reached 8,800 tons per day, beyond the daily production capacity.

More than three dozen countries, large and small, have pledged to help India, which on a single day this weekend reported a world record of 401,993 new infections. Daily deaths have nearly doubled over the past two weeks, hitting 3,689 on Saturday.

Relatives of the sick have taken to social media with pleas seeking not only portable oxygen tanks, but also hospital beds and medicines such as remdesivir. The country's misery has been compounded by a series of deadly hospital fires, including one on Saturday that killed 16 COVID patients and two health care workers in the western city of Bharuch.

Over the weekend, aid from a half-dozen countries touched down at airports across India; they included a shipment of 157 ventilators from the United Arab Emirates, 500 oxygen cylinders from Taiwan and 1,000 vials of remdesivir from Belgium.

The United States has pledged to provide $100 million worth of supplies, which will include 15 million N95 masks and a million rapid diagnostic tests. On Sunday, White House chief of staff Ron Kain said the Biden administration had sent the raw materials to produce 20 million vaccine doses, and he said the U.S. was considering whether to lift patents on vaccines to boost global production.

"We are rushing aid to India," Klain said in an appearance on CBS' "Face the Nation." The administration, he added would soon announce "how we can get this vaccine more widely distributed, more widely licensed, more widely shared."