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(AP Illustration / Peter Hamlin)

In places where the virus is surging, the U.S. Centers for Disease Control and Prevention recommends that vaccinated people return to wearing masks in public indoor places.

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People wearing masks line up for a food drive in Brighton Park on Chicago’s Southwest Side on April 23, 2020. (WTTW News)

Echoing a masking announcement from the Centers for Disease Control and Prevention, Illinois health officials are recommending that everyone, regardless of vaccination status, wear masks indoors in school settings and in areas where COVID-19 is spreading.

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Chicago Department of Public Health Commissioner Dr. Allison Arwady appears on “Chicago Tonight” via Zoom on Monday, July 26, 2021. (WTTW News)

The four-day music festival is expected to draw hundreds of thousands of people to Grant Park, and many are concerned it could become a “superspreader” event. But city officials say it will go on as planned. 

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President Joe Biden walks on the South Lawn of the White House after stepping off Marine One, Sunday, July 25, 2021, in Washington. Biden is returning to Washington after spending the weekend in Delaware. (AP Photo / Pablo Martinez Monsivais)

The United States will keep existing COVID-19 travel restrictions on international travel in place for now due to concerns about the surging infection rate because of the delta variant, according to a White House official.

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Top infectious disease expert Dr. Anthony Fauci responds to accusations by Sen. Rand Paul, R-Ky., as he testifies before the Senate Health, Education, Labor, and Pensions Committee, on Capitol Hill in Washington, Tuesday, July 20, 2021. (AP Photo / J. Scott Applewhite, Pool)

The United States is in an “unnecessary predicament” of soaring COVID-19 cases fueled by unvaccinated Americans and the virulent delta variant, the nation’s top infectious diseases expert said Sunday. 

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In this July 1, 2021, file photo, people walk through Salt Lake City International Airport in Salt Lake City. (AP Photo / Rick Bowmer, File)

Reports of athletes, lawmakers and others getting the coronavirus despite vaccination may sound alarming but top health experts point to overwhelming evidence that the shots are doing exactly what they are supposed to: dramatically reducing severe illness and death. 

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Mayor Lori Lightfoot addresses Chicago’s violent holiday weekend on July 6, 2021. (WTTW News)

The more transmissible delta variant now accounts for approximately 44% of all confirmed cases of the coronavirus in Chicago, said Dr. Allison Arwady, the commissioner of the Department of Public Health.

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(WTTW News)

“To any who have been hesitating about being vaccinated, please I implore you to hesitate no longer. We’re very concerned about the spread of this so-called delta variant,” said Dr. Kiran Joshi of the Cook County Department of Public Health. “Please go out, get vaccinated.”

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In this Sunday, July 11, 2021 file photo, a doctor fills a syringe with the Johnson & Johnson COVID-19 vaccine at a vaccination center in Kabul, Afghanistan. (AP Photo / Rahmat Gul, file)

Just because Pfizer wants to offer COVID-19 vaccine boosters doesn’t mean people will be lining up anytime soon — U.S. and international health authorities say that for now, the fully vaccinated seem well protected.

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In this Sunday, July 4, 2021, file photo, spectators watch as fireworks explode over the Las Vegas Strip during a 4th of July Fireworks show in Las Vegas. (AP Photo / John Locher, File)

The COVID-19 curve in the U.S. is rising again after months of decline, with the number of new cases per day doubling over the past three weeks, driven by the fast-spreading delta variant, lagging vaccination rates and Fourth of July gatherings. 

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(WTTW News)

Chicago officials have reinstated the city’s COVID-19 travel advisory as cases spike with the spread of the delta variant of the virus in Missouri and Arkansas. The order had been suspended for 42 days.

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A health worker prepares to administer a jab of the AstraZeneca COVID-19 vaccine during a vaccination drive for people ages 30 to 39 in Mexico City, Wednesday, July 7, 2021. (AP Photo / Marco Ugarte)

New research from France adds to evidence that widely used COVID-19 vaccines still offer strong protection against a coronavirus mutant that is spreading rapidly around the world and now is the most prevalent variant in the U.S.

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In this July 2, 2021, file photo, a woman breaks down as she prays before the cremation of a relative who died of COVID-19 in Gauhati, India. (AP Photo / Anupam Nath, File)

The global death toll from COVID-19 eclipsed 4 million Wednesday as the crisis increasingly becomes a race between the vaccine and the highly contagious delta variant.

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(WTTW News)

The delta variant, a more transmissible and possibly more dangerous strain of coronavirus, now makes up more than half of all new COVID-19 infections in the U.S., according to estimates from the U.S. Centers for Disease Control and Prevention.

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(AP Illustration / Peter Hamlin)

The short answer: Yes, but not nearly as much as if you had both doses. Experts recommend getting fully vaccinated, especially with the emergence of worrisome coronavirus mutations such as the delta variant first identified in India.

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In this June 11, 2021, file photo, customers wear face masks in an outdoor mall with closed business amid the COVID-19 pandemic in Los Angeles. (AP Photo / Damian Dovarganes, File)

The latest alarming coronavirus variant is exploiting low global vaccination rates and a rush to ease pandemic restrictions, adding new urgency to the drive to get more shots in arms and slow its supercharged spread.