CHICAGO (AP) — Chicago is among several large American cities identified as hot spots for COVID-19 infections and will see the number of local coronavirus cases rise, the U.S. surgeon general said Friday.

Surgeon General Jerome Adams said on “CBS This Morning" that he is hopeful New York, which has reported a nation-high 519 deaths and more than 44,000 confirmed cases, will see cases begin to come down next week. But he warned that Detroit, Chicago and New Orleans “will have a worse week next week."

Cases in Chicago and suburban Cook County account for about three-quarters of Illinois' 3,026 total as of Friday. Chicago and Cook County authorities have reported 20 deaths linked to the coronavirus, among 34 statewide.

But infections statewide have jumped 135% just since Monday, and the escalating number prompted Chicago Mayor Lori Lightfoot to predict that Gov. J.B. Pritzker's stay-at-home order, scheduled to expire in 10 days, will last “deep into April.”

At his daily briefing in Chicago, Pritzker would not comment on an extension but he was disturbed by the infection's upward trend.

“Nothing is set in stone,” Pritzker said. "There's been a progression here.”

For most people, the new coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. For some, especially older adults and people with existing health problems, it can cause more severe illness and death.

Lightfoot warned on Thursday that 40,000 people could need treatment at hospitals in the coming weeks as she ordered the city's lakefront trails and adjacent parks shut down.

Pritzker's stay-at-home dictum allows essential industry employees to work. People can run essential errands and exercise outside. But get your fresh air in groups of fewer than 10 and by staying six feet apart, the governor said.

“You are in danger and you are putting other people in danger if you don't adhere to these rules,” Pritzker said.

At the Pentagon, the Army Corps of Engineers' commander, Lt. Gen. Todd Semonite, told reporters the corps is setting up beds at Chicago's McCormick Place Convention Center to accommodate about 3,000 patients. The makeshift hospital, which will include 750 beds in what Semonite called self-contained units, will be ready by April 24.

Chicago officials are also working to reopen a shuttered hospital for patient space and hotels will provide rooms for patients with mild cases who still need to be quarantined.

The University of Illinois Hospital and Clinics in Chicago confirmed Friday that 12 registered nurses have tested positive for COVID-19. The Illinois Nurses Association made the announcement and said their members were forced to work without protective equipment such as masks and gloves.

Hospital CEO Michael Zenn responded in a statement that “a limited number of these cases are believed to be due to exposure in the health care setting.” He said no one treating patients suspected of having COVID-19 have gone without protective equipment. He added that starting Friday, all staff members would wear masks daily.

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AP National Security Writer Robert Burns contributed from Washington, D.C. O'Connor reported from Springfield, Ill.

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Follow AP coverage of the virus outbreak at https://apnews.com/VirusOutbreak and https://apnews.com/UnderstandingtheOutbreak