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The University of Chicago reported a COVID-19 outbreak at the beginning of April. (WTTW News)

Students at an unidentified Chicago university who traveled over spring break sparked an outbreak of COVID-19 that sickened 158 people, according to a report from the Centers for Disease Control and Prevention released Thursday.

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(Credit: Joe Raedle / Getty Images)

Due to the surge of COVID-19 cases, the director of the U.S. Centers for Disease Control and Prevention is asking unvaccinated Americans not to travel during the Labor Day holiday weekend.

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In this Aug. 4, 2021, file photo, housing advocates protest the eviction moratorium in New York. (AP Photo / Brittainy Newman, File)

Tenant advocates and court officials were gearing up Friday for what some fear will be a wave of evictions and others predict will be just a growing trickle after a U.S. Supreme Court action allowing lockouts to resume.

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According to recent reports, the Centers for Disease Control and Prevention decided in May to stop tracking all COVID-19 breakthrough cases and is instead only gathering data on the most severe cases. (WTTW News)

As the delta variant continues to drive a spike in COVID-19 cases, two recent reports outline the challenges of tracking so-called breakthrough cases in fully vaccinated people. We discuss the importance — and limitations — of disease surveillance.

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Health officials have linked Fratelli Beretta brand prepackaged uncured antipasto trays to national salmonella outbreaks. (Fratelli Beretta / Facebook)

Health officials are advising people not to eat Fratelli Beretta brand prepackaged uncured antipasto trays, which have been linked to salmonella outbreaks that have sickened 36 people across the country. 

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Health officials across the country are investigating multistate outbreaks of salmonella linked to Italian-style meats, including prosciutto. (Ben Kerckx / Pixabay)

Federal health officials are investigating multistate salmonella outbreaks linked to Italian-style meats, including salami and prosciutto, that have sickened 36 people across the country, including four in Illinois.

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Gary Zaremba knocks on an apartment door as he checks in with tenants to discuss building maintenance at one of his at properties, Thursday, Aug. 12, 2021, in the Queens borough of New York. (AP Photo / John Minchillo)

A three-judge panel of the U.S. Court of Appeals for the District of Columbia rejected a bid by Alabama and Georgia landlords to block the eviction moratorium reinstated by the Centers for Disease Control and Prevention earlier this month.

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In this July 22, 2021, file photo, health care worker fills a syringe with the Pfizer COVID-19 vaccine at the American Museum of Natural History in New York. (AP Photo / Mary Altaffer, File)

U.S. health officials Wednesday announced plans to dispense COVID-19 booster shots to all Americans to shore up their protection amid the surging delta variant and signs that the vaccines’ effectiveness is falling.

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In this Thursday, Feb. 25, 2021 file photo, vials for the Moderna and Pfizer COVID-19 vaccines are displayed on a tray at a temporary clinic set up by the New Hampshire National Guard in the parking lot of a high school in Exeter, N.H. (AP Photo / Charles Krupa)

Americans at high risk from COVID-19 because of severely weakened immune systems are now allowed to get a third vaccination in hopes of better protection, a policy change endorsed Friday by influential government advisers.

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In this Jan. 15, 2021, file photo, Dr. Yomaris Pena, internal medicine physician with Somos Community Care, extracts the Pfizer COVID-19 vaccine out of a vial at a vaccination site at the Corsi Houses in the East Harlem neighborhood of New York. (AP Photo / Mary Altaffer, File)

The Centers for Disease Control and Prevention is expected to formally recommend the extra shots for certain immune-compromised groups after a meeting Friday of its outside advisers.

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In this May 7, 2020 file photo, a pregnant woman wearing a face mask and gloves holds her belly as she waits in line for groceries at St. Mary’s Church in Waltham, Mass. (AP Photo / Charles Krupa, file)

The Centers for Disease Control and Prevention urged all pregnant women Wednesday to get the COVID-19 vaccine as hospitals in hot spots around the U.S. see disturbing numbers of unvaccinated mothers-to-be seriously ill with the virus.

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Housing advocate Jabari Brisport protests outside Gov. Andrew Cuomo’s office on the eviction moratorium on Wednesday, Aug. 4, 2021, in New York. (AP Photo / Brittainy Newman)

After a federal eviction moratorium was allowed to lapse this weekend, the Centers for Disease Control and Prevention issued a new moratorium Tuesday on evictions that would last until Oct. 3.

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(WTTW News)

With classes for students in pre-K through 12th grade set to resume across Illinois in the coming weeks, Gov. J.B. Pritzker on Wednesday announced a mask mandate for all students and staff at public and private schools.

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Supporters of Rep. Cori Bush, D-Mo., camp with her outside the U.S. Capitol, in Washington, Monday, Aug. 2, 2021, as anger and frustration has mounted in Congress after a nationwide eviction moratorium expired at midnight Saturday. (AP Photo / Jose Luis Magana)

The Centers for Disease Control and Prevention issued a new eviction moratorium that would last until Oct. 3, as the Biden administration sought to quell intensifying criticism from progressives that it was allowing vulnerable renters to lose their homes during a pandemic.

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(AP Illustration / Peter Hamlin)

The latest guidance from the U.S. Centers for Disease Control and Prevention says people who are fully vaccinated should get tested three to five days after a potential exposure, even if they don’t have symptoms.

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In this July 19 2021 file photo, employees check out customers at 2nd Street second hand store in the Fairfax district of Los Angeles. (AP Photo / Marcio Jose Sanchez, File)

New evidence showing the delta variant is as contagious as chickenpox and may be more dangerous than other versions has prompted U.S. health officials to consider changing advice on how the nation fights the coronavirus, internal documents show.