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Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a press briefing at the White House, Tuesday, April 13, 2021, in Washington. (AP Photo / Patrick Semansky)

Half of all adults in the U.S. have received at least one COVID-19 shot, the government announced Sunday, marking another milestone in the nation’s largest-ever vaccination campaign but leaving more work to do to convince skeptical Americans to roll up their sleeves.

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In this March 6, 2021, file photo, boxes stand next vials of Johnson & Johnson COVID-19 vaccine in the pharmacy of National Jewish Hospital for distribution in Denver. (AP Photo / David Zalubowski, File)

The United States will likely move to resume Johnson & Johnson’s COVID-19 vaccine this coming week, possibly with restrictions or broader warnings after reports of some very rare blood clot cases, the government’s top infectious diseases expert said Sunday.

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(WTTW News)

Health officials recommended a pause on the Johnson & Johnson COVID-19 vaccine this week after six people experienced rare but severe blood clots. We discuss the situation—and concerns about vaccine hesitancy—with Dr. Juanita Mora, an allergist and immunologist at the Chicago Allergy Center.

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(WTTW News)

“Our young adults have a key role to play in bringing this pandemic to an end,” Gov. J.B. Pritzker said in a statement Friday announcing state-supported mass vaccination sites will have appointments available specifically for college students starting this weekend.

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(WTTW News)

In all, 888 cases involving the variant, known as B.1.1.7, have been found in samples of COVID-19 positive tests from Illinois since Jan. 15, officials said. 

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A sign promoting social distancing is shown inside a Chicago Public Schools building. (WTTW News)

Chicago Public Schools high school students will return to the classroom on Monday if teachers agree to the framework announced Thursday by the district and the Chicago Teachers Union.

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The United States opened more distance between itself and much of the rest of the world on Thursday, April 15, nearing the 200 millionth vaccine administered in a months-long race to protect the population against COVID-19, even as other countries, rich and poor, struggle with stubbornly high infection rates and deaths. (AP Photo / Mary Altaffer, Pool, File)

The United States opened more distance between itself and much of the rest of the world Thursday, nearing the 200 millionth vaccine administered in a race to protect the population against COVID-19, even as other countries, rich and poor, struggle with stubbornly high infection rates and deaths.

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(WTTW News)

The county has seen virus-related hospitalizations increase for 10 consecutive days; and for three days, the availability of intensive care unit beds has dipped below 20%, according to public health data reported Thursday.

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Troy Hernandez, an environmental justice activist with Pilsen Environmental Rights and Reform Organization shows a piece of lead pipe obtained from his residence during his home renovation, Friday, April 9, 2021 in Chicago's Pilsen neighborhood. Hernandez recently spent $15,000 to replace the lead service lines bringing water into his home. (AP Photo / Shafkat Anowar)

 In the modest bungalows and two-flats of Chicago’s Little Village neighborhood, there’s never a shortage of needed home repairs staring residents in the face. And then there is the less obvious but more ominous problem lurking in their pipes.

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Dr. Kenneth Wilson, left, medical director of University of Chicago Medicine’s trauma center, works with Lt. Col. Timothy Plackett, DO, a trauma surgeon from the U.S. Army who is spending the next three years working at the Hyde Park academic medical center. (Credit: University of Chicago Medicine)

The partnership announced Thursday will help better prepare surgeons, nurses and medics ahead of deployments by keeping their skills sharp while also supporting patients who need critical care.

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In this March 3, 2021, file photo, Johnson & Johnson COVID-19 vaccine is held by pharmacist Madeline Acquilano at Hartford Hospital in Hartford, Conn. (AP Photo / Jessica Hill, File)

Johnson & Johnson’s COVID-19 vaccine will remain in limbo for a while longer after government health advisers declared Wednesday that they need more evidence to decide if a handful of unusual blood clots were linked to the shot — and if so, how big the risk really is.

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(Andrés Rodríguez / Pixabay)

More than 1.5 million COVID-19 vaccines have been administered in suburban Cook County. While the pace of vaccinations is ramping up, infections are rising, keeping contact tracers busy doing vital work to stop the spread of the virus, officials say.

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In this Jan. 27, 2021 file photo, patrons enjoy lunch indoors at Gibsons Italia restaurant in Chicago. A recent spike in coronavirus cases in some states has led one of the nation's top health experts to suggest that governors could “close things down” like they did during previous surges. But that doesn't appear likely to happen — not even in states led by Democratic governors who favored greater restrictions in the past. (AP Photo / Charles Rex Arbogast, File)

Vaccination rates have grown, warmer weather has returned, and the public and business owners have become increasingly vocal about reopening schools and loosening restrictions around social gatherings.

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(WTTW News)

In 2012, Mayor Rahm Emanuel’s administration closed half of the city’s clinics. Mayor Lori Lightfoot campaigned on reopening the centers but has focused her tenure so far on investing in organizations that provide mental health services.

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In this Thursday, April 8, 2021 file photo, the Johnson & Johnson COVID-19 vaccine sits on a table at a pop-up vaccinations site the Albanian Islamic Cultural Center, in the Staten Island borough of New York. (AP Photo / Mary Altaffer, File)

The U.S. on Tuesday recommended a “pause” in use of the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of rare but potentially dangerous blood clots, setting off a chain reaction worldwide and dealing a setback to the global vaccination campaign.

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Gov. J.B. Pritzker receives the Johnson & Johnson COVID-19 vaccine on Wednesday, March 24, 2021 at a mass vaccination site in Springfield. (WTTW News)

Health officials said they were acting “out of an abundance of caution” following six cases of a rare and severe type of blood clot in individuals who got the one-dose Johnson & Johnson vaccine.