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

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.

Most U.S. states are reporting high or very high flu-like activity, while COVID-19 rates remain lower than this time last year.

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.

If it feels like everyone around you is fighting off a cold or recovering from the flu, it may be because respiratory illnesses are running rampant in most of the United States, and cases are only increasing.

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.

Flu and COVID-19 case counts are high and rising in most parts of the United States, according to recent data by the Centers for Disease Control and Prevention (CDC). RSV case counts are also elevated in most states, especially in children.

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.