Fact checked by Nick Blackmer Cases of respiratory syncytial virus (RSV) have peaked in many areas of the United States, according to data released last week by the Centers for Disease Control and Prevention (CDC).

— 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.

The Health Department of Northwest Michigan is reporting an increase in respiratory illnesses across Antrim, Charlevoix, Emmet and Otsego counties this winter.

When broken down by state, most of the country is experiencing elevated respiratory illness, including a few states with “very high” ratings that act as national hotspots, CDC data shows.

Statewide data released Thursday by the Minnesota Department of Health indicates that hospitalizations for influenza and COVID-19 have slightly declined for the first time in over a month.

Flu season is here in New Jersey, but other illnesses are in full swing in the Garden State. Here are the symptoms and how long you're contagious.