While a seasonal uptick in respiratory viruses is expected in winter each year, we’re still seeing higher overall numbers than in previous seasons, Sundareshan said. Along with respiratory viruses, a “very contagious” stomach bug is also causing illnesses.

— The flu, caused by influenza viruses that are always changing, leads to fever, chills, cough, sore throat, runny nose, body aches, headaches and feeling tired. Flu symptoms tend to hit more quickly than cold symptoms, and can last anywhere from a few days to two weeks.

Many hospitals are requiring masks as illnesses amp up around the state of Illinois. According to multiple Illinois health systems, they've started implementing mask mandates throughout their facilities as respiratory infections, flu, RSV, and norovirus continue to spread across the state as winter settles in.

CHICAGO – Parents, beware: Kids are back in school and the virus known as the stomach flu is on the rise.

Health cases regarding the norovirus are on the rise. The Will County Health Department is reminding residents to be cautious about the spread of norovirus, which the Centers for Disease Control and Prevention and Illinois Department of Public Health have issued warnings about in recent weeks.

The CDC and IDPH have reported increased numbers of norovirus in Illinois and the country, with outbreaks occurring in Will County, and the Will County Health Department is reminding residents to take precautions to prevent the spread of the virus.

Bon Secours and Prisma Health are implementing new visitor restrictions as cases of influenza and respiratory illnesses rise across the country.

Many of Chicago's health systems, concerned by rising rates of the flu, RSV and COVID, are returning to the pandemic-era standby for staff and patients.

Vaccinations for flu and COVID-19 in Chicago are down from last year, according to a report by local health officials.

Multiple norovirus outbreaks have been reported in Chicago during the month of January, the Chicago Department of Public Health confirmed this week.

As the norovirus outbreak continues to spread in the U.S., you can't rely on hand sanitizer alone to protect you. Norovirus, also sometimes called the "winter vomiting disease," causes ...

The U.S. is seeing a "quad-demic" as cases of COVID-19, flu, RSV and norovirus spread at the same time. Experts said this is what you need to know.