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FILE - In this Jan. 7, 2021, file photo, a medical worker walks past a refrigerated trailer parked outside the Cedars-Sinai Medical Center in Los Angeles. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. Cedars-Sinai Medical Center ran into shortages of take-home oxygen tanks, which meant some patients who could otherwise go home were kept longer, taking up needed beds. (AP Photo/Damian Dovarganes, File)

FILE - In this Jan. 7, 2021, file photo, a medical worker walks past a refrigerated trailer parked outside the Cedars-Sinai Medical Center in Los Angeles. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. Cedars-Sinai Medical Center ran into shortages of take-home oxygen tanks, which meant some patients who could otherwise go home were kept longer, taking up needed beds. (AP Photo/Damian Dovarganes, File)

FILE - In this Jan. 7, 2021, file photo, two nurses put a ventilator on a patient in a COVID-19 unit at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Jan. 7, 2021, file photo, two nurses put a ventilator on a patient in a COVID-19 unit at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Jan. 7, 2021, file photo, registered nurses Kyanna Barboza, right, tends to a COVID-19 patient as Kobie Walsh puts on her PPE at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Jan. 7, 2021, file photo, registered nurses Kyanna Barboza, right, tends to a COVID-19 patient as Kobie Walsh puts on her PPE at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Jan. 7, 2021, file photo, a caution sign is placed on the floor of a COVID-19 unit at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Jan. 7, 2021, file photo, a caution sign is placed on the floor of a COVID-19 unit at St. Joseph Hospital in Orange, Calif. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Nov. 19, 2020, file photo, Dr. Rafik Abdou checks on a COVID-19 patient at Providence Holy Cross Medical Center in the Mission Hills section of Los Angeles. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

FILE - In this Nov. 19, 2020, file photo, Dr. Rafik Abdou checks on a COVID-19 patient at Providence Holy Cross Medical Center in the Mission Hills section of Los Angeles. U.S. hospital intensive care units in many parts of the country are straining under record numbers of COVID-19 patients. (AP Photo/Jae C. Hong, File)

Dr. Cameron Mantor, Chief Medical Officer at OU Medicine, poses for a photo outside the hospital complex Thursday, Jan. 21, 2021, in Oklahoma City. Mantor said while the vaccines hold promise, hope still seems dim as ICU cases keep mounting. (AP Photo/Sue Ogrocki)

Dr. Cameron Mantor, Chief Medical Officer at OU Medicine, poses for a photo outside the hospital complex Thursday, Jan. 21, 2021, in Oklahoma City. Mantor said while the vaccines hold promise, hope still seems dim as ICU cases keep mounting. (AP Photo/Sue Ogrocki)