SAN FRANCISCO (AP) — Since the coronavirus pandemic took hold in the U.S., Sara Houze has been on the road — going from one hospital to another to care for COVID-19 patients on the brink of death.

A cardiac intensive care nurse from Washington, D.C., with expertise in heart rhythm, airway and pain management, her skills are in great demand as infections and hospitalizations skyrocket nationwide. Houze is among more than 500 nurses, doctors and other medical staff California has deployed to hospitals that are running out of capacity to treat the most severe COVID-19 cases.

Her six-week assignment started Monday in San Bernardino, about 60 miles (97 kilometers) east of Los Angeles, and she anticipates working 14-hour shifts with a higher-than-usual caseload. San Bernardino County has 1,545 people in hospitals and more than 125 are in makeshift “surge" beds, which are being used because regular hospital space isn't available.

“I expect patients to die. That’s been my experience: They die, I put them in body bags, the room gets cleaned and then another patient comes,” Houze said.

The staffing shortage comes as shipments of the COVID-19 vaccine trickle out to health care workers and nursing home residents across the country. Most Americans will have access to the injections by mid-summer, said Dr. Anthony Fauci, the nation’s top infectious disease expert.

Fauci told “Good Morning America” on Tuesday that he expects to start vaccinating the general population in late March or early April. The process could take up to four months to reach all Americans who want the vaccine, he said.

Fauci received the initial dose of the newest vaccine, produced by Moderna, alongside other federal health leaders who helped oversee its development.

Much of California has exhausted its usual ability to staff intensive care beds, and the nation's most populated state is desperately searching for 3,000 temporary medical workers to meet demand. State officials are reaching out to foreign partners in places like Australia and Taiwan amid a shortage of temporary medical workers in the U.S., particularly nurses trained in critical care.

Gov. Gavin Newsom said the state has relationships with countries that provide aid during crises such as wildfires.

“We’re now in a situation where we have surges all across the country, so nobody has many nurses to spare,” said Dr. Janet Coffman, a professor of public policy at the University of California, San Francisco.

California hospitals typically turn to staffing agencies during flu season, when they rely on travel nurses to meet patient care needs. It is the only state in the nation with strict nurse-to-patient ratios requiring hospitals to provide one nurse for every two patients in intensive care and one nurse for every four patients in emergency rooms, for example.

However, those ratio requirements are being waived at many hospitals as virus cases surge.

But the pool of available travel nurses is drying up as demand for them jumped to 44% over the last month, with California, Texas, Florida, New York and Minnesota requesting the most extra staff, according to San Diego-based health care staffing firm Aya Healthcare. It is one of two companies contracted by California to fulfill hospitals' staffing requests.

“We are hiring like crazy and working insane hours,” said Sophia Morris, vice president of account management at Aya Healthcare.

Dr. Mark Ghaly, California's Health and Human Services secretary, said the state is “lucky to get two-thirds” of its requests for travel nurses fulfilled right now.

It's a sharp contrast from the spring, when Newsom issued the nation's first stay-at-home order. As infection rates slowed and hospitals voluntarily suspended elective surgeries for weeks, health care providers from California flew to New York to help their overworked colleagues.

This time, many hospitals are postponing procedures that are not emergencies, said Jan Emerson-Shea, a spokeswoman for the California Hospital Association. California also has opened alternative care facilities for people with less serious illnesses to save hospital beds for the sickest patients.

That also means hospitals have fewer nurses to deploy to ICUs from other units, Coffman said. And many health workers became infected or have had to quarantine because they were exposed to someone with COVID-19 during the surge, she said.

Another factor is the dip in the number of nurses 60 and older. In a survey of the state's 320,000 registered nurses, many older nurses told researchers at UCSF's Healthforce Center that they stopped working out of concern for their or their family’s health, said Joanne Spetz, the center's associate director of research.

On Monday, more than 17,000 people were hospitalized with confirmed COVID-19 infections — more than double the previous peak reached in July — and a state model that uses current data to forecast future trends shows the number could reach nearly 100,000 by January.

More than 3,600 COVID-19 patients were in intensive care units.

Ghaly said entire areas of California may run out of room even in surge capacity units “by the end of the month and early in January.” It's trying to avoid that by opening makeshift hospitals in places like gymnasiums, tents and a vacant NBA arena, and sending patients to parts of the state with empty beds.

This past spring, Newsom sought to reinforce fatigued medical workers by creating a paid volunteer network, but with cases skyrocketing now, just 28 members are working at 13 facilities despite pleas for more retired medical professionals to sign up.

The state is updating its planning guide for how hospitals would ration care if necessary.

A document recently circulated among doctors at the four hospitals run by Los Angeles County calls for them to shift strategy: Instead of trying everything to save a life, their goal during the crisis is to save as many patients as possible. Those less likely to survive would not get the same kind of care offered in normal times.

Houze said her online community of nurses is offering webinars about moral distress because many of them have had to change the way they care for patients.

“The patients that aren't yet intubated, and even the ones intubated, aren't getting the kind of nursing care that I want to give them because our resources are so limited and time is taxed,” she said. “It's really disheartening.”

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Associated Press Writer Don Thompson in Sacramento contributed to this report.