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.

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.

Influenza A, COVID-19 and norovirus (stomach flu) are on the rise, according to the Centers for Disease Control and Prevention. But there's a fourth "bug" the public should be aware of: respiratory syncytial virus. RSV causes cold-like symptoms and affects the breathing passages and lungs.

There’s no medication for norovirus. Instead, you’ll need to rehydrate as much as possible with water and other liquids. Seek help if you are dehydrated and notice you have a dry mouth and throat, aren’t urinating as much or feel dizzy when you’re standing up.

You’ll likely hear of more people becoming infected with COVID this winter, and you should know the symptoms to look out for to keep yourself and your loved ones safe. Below, doctors share the most common signs of a COVID infection this season.

Cold, flu, norovirus, and COVID-19 share overlapping symptoms like fever, cough, and fatigue, but differ in severity and duration. Handwashing, vaccines, and staying home when sick can help prevent infections.