Eight people have been infected with salmonella typhimurium, with illness starting on dates ranging from June 10 to June 15, according to the Centers for Disease Control and Prevention. 

The infected mosquitoes were found in the O’Hare and Beverly community areas, according to the Chicago Department of Public Health.

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.

The more transmissible delta variant is expected to become the dominant coronavirus strain in the U.S., the director of the Centers for Disease Control and Prevention said. And with half the U.S. still not fully vaccinated, doctors say it could cause a resurgence of COVID-19 in the fall.

The Centers for Disease Control and Prevention says the agency is tracking the Delta coronavirus variant, among others — and warned that there is a small chance a fully vaccinated person could still get infected if they’re exposed.

The Biden administration on Thursday extended the nationwide ban on evictions for a month to help millions of tenants unable to make rent payments during the coronavirus pandemic,  but said this is the last time it plans to do so. 

The U.S. government is stepping up efforts to get younger Americans vaccinated for COVID-19 as concerns grow about the spread of a new variant that threatens to set the country back in the months ahead.

Dozens of different at-home COVID-19 tests are now available from big-box retailers and pharmacies. But before you run out and buy one, a few words of caution from Dr. Emily Landon, an infectious disease specialist at UChicago Medicine.

A new analysis of blood samples from 24,000 Americans taken early last year is the latest and largest study to suggest that the new coronavirus popped up in the U.S. in December 2019 — weeks before cases were first recognized by health officials. 

The Centers for Disease Control and Prevention reports the COVID-19 vaccine can cause swelling in the lymph nodes in the underarm where women received the shot, which the agency says is normal. But that swelling can appear in mammograms. Here’s what you need to know. 

The government’s new guidance on masks for vaccinated people has left some Americans confused and sent businesses and states scrambling to adjust their rules. 

Gov. J.B. Pritzker on Monday lifted the state’s mask mandate for fully vaccinated residents. But not everyone is ready to follow the new guidance. We talk about the future of masks with Jocelyn Carter, director of clinical training at DePaul University.

Following new CDC guidance, Gov. J.B. Pritzker lifted the state’s mask mandate for fully vaccinated residents on Monday. But Mayor Lori Lightfoot says she will continue to wear a mask, both indoors and outdoors, even though she is fully vaccinated. 

The head of the Centers for Disease Control and Prevention on Sunday defended the decision to ease mask-wearing guidance for fully vaccinated people, stressing that increasing political pressure had nothing to do with the abrupt shift in guidelines.

More than a dozen states quickly embraced new federal guidelines that say fully vaccinated Americans no longer need to wear masks indoors or out in most cases. But other states and cities and some major businesses hesitated amid doubts about whether the approach is safe or even workable.

Chicago and Illinois officials said Thursday they will follow new guidance from the Centers for Disease Control and Prevention and jettison rules that require fully vaccinated people to wear masks indoors. However, masks are not “going away,” according to city health officials.