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This October 2021 photo provided by Pfizer shows kid-size doses of its COVID-19 vaccine in Puurs, Belgium. (Pfizer via AP)

Kid-size doses of Pfizer’s COVID-19 vaccine appear safe and nearly 91% effective at preventing symptomatic infections in 5- to 11-year-olds, according to study details released Friday as the U.S. considers opening vaccinations to that age group.

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(WTTW News)

All licensed day care center staff in Illinois must receive their first dose of a COVID-19 vaccine by Dec. 3, according to an executive order issued Friday by Gov. J.B. Pritzker. Staff who are not fully vaccinated by Dec. 3 must, at a minimum, undergo weekly testing until they’re fully vaccinated.

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(Sincerely Media / Unsplash)

More than 650 people have been infected with salmonella oranienburg nationwide, including 37 people in Illinois, according to federal health officials. 

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(AP Illustration / Peter Hamlin)

With more than half the world still not vaccinated, the virus will likely keep finding people to infect and replicating inside them for several months or years to come.  And each time a virus makes a copy of itself, a small mutation could occur. 

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The coronavirus has become the leading cause of death for officers despite law enforcement being among the first groups eligible to receive the vaccine at the end of 2020. (Credit: KGO)

The coronavirus has become the leading cause of death for officers despite law enforcement being among the first groups eligible to receive the vaccine at the end of 2020.

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A still image from a video taken of the demolition of the Crawford Coal Plant smokestack, April 11, 2020. (Alejandro Reyes / YouTube)

The final report from former Inspector General Joseph Ferguson did not detail why he concluded that the three employees should be disciplined, or whether city leaders would follow his recommendations.

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(Ana Krach / Pixabay)

With Halloween and Día de los Muertos fast approaching, state health officials released guidelines Friday to help people safely celebrate common fall traditions, like trick-or-treating and visits to pumpkin patches.

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Fraternal Order of Police Lodge 7 President John Catanzara appears on “Chicago Tonight” via Zoom on Thursday, May 14, 2020. (WTTW News)

Fraternal Order of Police President John Catanzara's actions and rhetoric "threatens the health and safety of Chicago’s residents and first responders," Mayor Lori Lightfoot said.

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(WTTW News)

Chicago Public Schools CEO Pedro Martinez said those staffers who are not fully vaccinated by Friday’s deadline must consent to weekly testing, but will not be immediately barred from working, as had previously been threatened.

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In this Friday June 15, 2012 file photo, Motorists make their way to Ambassador Bridge connecting Canada to the United States in Windsor, Ontario. (Mark Spowart / The Canadian Press via AP, File)

Beleaguered business owners and families separated by COVID-19 restrictions rejoiced Wednesday after the U.S. said it will reopen its land borders to nonessential travel next month, ending a 19-month freeze.

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(WTTW News)

While COVID-19 cases and hospitalizations have dropped nationally, a local infectious disease expert says the situation is a little more complex than whether or not the nation is reaching herd immunity.

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(FotoshopTofs / Pixabay)

“Although we are already into fall, we are expecting a warm weekend and West Nile virus remains a risk until the first hard frost,” Illinois Department of Public Health Director Dr. Ngozi Ezike said in a statement. 

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(WTTW News)

But with a week to go until her declared deadline, Mayor Lori Lightfoot stepped back and said she would not discipline unvaccinated employees. 

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(AP Illustration / Peter Hamlin)

When COVID-19 vaccines were first rolling out in the U.S., the Centers for Disease Control and Prevention recommended waiting 14 days between the shots and other immunizations as a precaution. But the agency has since revised its guidelines and says the wait is unnecessary.

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President Joe Biden speaks about COVID-19 vaccinations after touring a Clayco Corporation construction site for a Microsoft data center in Elk Grove Village, Ill., Thursday, Oct. 7, 2021. (AP Photo / Susan Walsh)

President Joe Biden on Thursday championed COVID-19 vaccination requirements, determined that the roughly 67 million unvaccinated American adults must get the shot even as he acknowledged that mandates weren’t his “first instinct.”

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A health care worker holds a vial of the Pfizer COVID-19 vaccine at Jackson Memorial Hospital in Miami, in this Tuesday, Oct. 5, 2021, file photo. (AP Photo / Lynne Sladky, File)

Pfizer asked the U.S. government Thursday to allow use of its COVID-19 vaccine in children ages 5 to 11 – and if regulators agree, shots could begin within a matter of weeks.