FILE - In this Feb. 2, 2021, file photo, a nurse cleans a patient suffering from COVID-19 in the ICU at the La Timone hospital in Marseille, southern France. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Daniel Cole, File)

FILE - In this April 13, 2021, file photo, the remains of a woman who died from complications related to COVID-19 are placed into a niche by cemetery workers and relatives at the Inahuma cemetery in Rio de Janeiro, Brazil. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Silvia Izquierdo, File)

Nurse Lidiane Melo cries during an interview with The Associated Press at her home in Rio de Janeiro, Brazil, Wednesday, April 14, 2021. In the early days of the pandemic, as sufferers were calling out for comfort that she was too busy to provide, Melo filled two rubber gloves with warm water, knotted them shut, and sandwiched them around a patient's hand, to re-create a loving clasp. Some have christened the practice the "hand of God," and it is now the searing image of a nation roiled by a medical emergency with no end in sight. (AP Photo/Silvia Izquierdo)

FILE - In this March 15, 2021, file photo, boxes of AstraZeneca COVID-19 vaccine manufactured by the Serum Institute of India and provided through the global COVAX initiative arrive at the airport in Mogadishu, Somalia. India said in March it would suspend vaccine exports until the virus's spread inside the country slows. The WHO recently described the supply situation as precarious. (AP Photo/Farah Abdi Warsameh, File)

FILE - In this April 13, 2021, file photo, Health workers treat a COVID-19 patient at the emergency unit of a field hospital set up to treat COVID patients in Ribeirao Pires, greater Sao Paulo area, Brazil. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Andre Penner, File)

Two latex gloves filled with warm water cover the hand of the husband of nurse Lidiane Melo as she demonstrates at their home in Rio de Janeiro, Brazil, Wednesday, April 14, 2021. In the early days of the pandemic, as sufferers were calling out for comfort that she was too busy to provide, Melo put water-filled gloves on patients' hands to simulate a loving touch. Some have christened the practice the "hand of God," and it is now the searing image of a nation roiled by a medical emergency with no end in sight. (AP Photo/Silvia Izquierdo)

FILE - In this April 15, 2021, file photo, a municipal worker in personal protective suit performs last rites during the cremation of a COVID-19 victim in Vasai, outskirts of Mumbai, India. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Rafiq Maqbool, File)

FILE - In this March 16, 2021, file photo, Pharmacist Rajan Shah prepares a syringe of the AstraZeneca vaccine at St John's Church, in Ealing, London. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Kirsty Wigglesworth, File)

FILE - In this Feb. 18, 2021, file photo, a senior receives her second dose of China's Sinovac CoronaVac vaccine, during a priority vaccination program for the elderly at the Bezerra de Menezes Asylum in Brasilia, Brazil. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Eraldo Peres, File)

FILE - In this April 13, 2021, file photo, the body of a person who died of COVID-19 is brought for cremation at the Vasai crematory in Palghar, near Mumbai, India. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Rajanish Kakade, File)

FILE - In this April 15, 2021, file photo, Carlos Alberto holds out his left arm during the burial service for his 41-year-old wife Aparecida de Freitas, who died from complications related to COVID-19, in the Inhauma cemetery, in Rio de Janeiro, Brazil. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Bruna Prado, File)

FILE - In this April 12, 2021, file photo, Freeson Wong, 31, takes a selfie as he receives a dose of the Moderna vaccine at a vaccination center in the Chinatown neighborhood of Los Angeles. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Jae C. Hong, File)

FILE - In this April 15, 2021, file photo, a woman gets her swab sample taken to test for COVID-19 at a government hospital in Noida, a suburb of New Delhi, India. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Altaf Qadri, File)

Nurse Lidiane Melo sits during an interview with The Associated Press at her home in Rio de Janeiro, Brazil, Wednesday, April 14, 2021. In the early days of the pandemic, as sufferers were calling out for comfort that she was too busy to provide, Melo filled two rubber gloves with warm water, knotted them shut, and sandwiched them around a patient's hand, to re-create a loving clasp. Some have christened the practice the "hand of God," and it is now the searing image of a nation roiled by a medical emergency with no end in sight. (AP Photo/Silvia Izquierdo)

FILE - In this April 9, 2021, file photo, people queue to be vaccinated with the AstraZeneca vaccine against COVID-19 during a vaccination campaign at WiZink indoor arena in Madrid, Spain. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign and a deepening crisis in places such as Brazil, India and France. (AP Photo/Manu Fernandez, File)

FILE - In this April 14, 2021, file photo, messages written by loved ones and dedicated to the deceased hang from a wall at a memorial for COVID-19 victims installed outside the Basilica of Guadalupe in Mexico City. The global death toll from the coronavirus topped a staggering 3 million people Saturday, April 17, 2021, amid repeated setbacks in the worldwide vaccination campaign. (AP Photo/Eduardo Verdugo, File)