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Registered nurse Angela Choi looks around the emergency department as she works around the clock to treat patients that have possible COVID-19 symptoms and have been placed in special negative pressure isolation rooms inside the Emergency Department at Sharp Memorial Hospital in San Diego, Calif., on April 10, 2020.  (Marcus Yam / Los Angeles Times)

The emergency medicine unit at Palomar Medical Center Escondido was ready to received a large wave of patients. Registered Nurse William Schiavo cleans his personal protective equipment after entering into a negative pressure isolation room where patient with possible COVID-19 symptoms are receiving care.  (Marcus Yam / Los Angeles Times)

Wearing personal protective equipment, Registered Nurse April Bandi cares for a patient that has possible COVID-19 symptoms inside a special negative pressure isolation room at the Emergency Department at Sharp Memorial Hospital in San Diego on April 10, 2020.  (Marcus Yam / Los Angeles Times)

Registered Nurse Shauna Stanfill, left, checks on an incoming patient that has possible COVID-19 symptoms that was brought to Sharp Chula Vista Medical Center on April 10, 2020.  (Marcus Yam / Los Angeles Times)

Registered Nurse Sarah Barrile cares for a patient diagnosed with COVID-19 symptoms that has been placed on a mechanical ventilator inside the Intensive Care Unit at Sharp Memorial Hospital in San Diego on April 10, 2020. As a way to prevent overexposure to a hazardous environment, health professionals have started to place health monitors outside the negative pressure room.  (Marcus Yam / Los Angeles Times)

Registered nurses Shauna Stanfill, left, and Arnold Garcia administer care for Michael Weiss after he was admitted with possible COVID-19 symptoms at Sharp Chula Vista Medical Center on April 10, 2020.  (Marcus Yam / Los Angeles Times)

Registered Nurse Linda Isidienu signals for her co-worker Michael Manriquez to come help with a patient diagnosed with COVID-19 and placed on a ventilator inside a negative- pressure isolation room at the Intensive Care Unit at Sharp Chula Vista Medical Center on April 10, 2020.  (Marcus Yam / Los Angeles Times)