After the holiday season and an uptick in travel, California is seeing a rise in respiratory illnesses, prompting health experts to talk of a potential “quad-demic.” The term refers to the simultaneous spread of four major viruses: COVID-19,

The flu vaccine is generally about 40% effective at completely preventing influenza, according to Blumberg. The flu vaccine protects against three strains of influenza, including two influenza A strains. It also protects against influenza B, which typically shows up later in the season, Blumberg said.

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.

The CASPER also found that just less than half of households reported having at least one health symptom caused by the cross-border sewage crisis, such as headaches, nausea and dry throat. Most with chronic conditions, such as allergies, migraines, asthma and lung pain, said their symptoms have worsened.

The U.S. Centers for Disease Control and Prevention (CDC) confirmed another human H5N1 avian flu case -- otherwise kno

The CDC has confirmed a positive bird flu case in a child in San Francisco, the second juvenile case of H5N1 in the country.

Have South Bay residents suffered health problems because of ongoing issues with Tijuana River sewage? Many think so.

In California, a person who tests positive for Covid and has no symptoms does not need to isolate, according to new state health guidelines. People who test positive and have mild symptoms ...

The latest confirmation likely reflects follow-up testing of a San Francisco child whose exposure to the virus is still under investigation.

The Los Angeles fires continue to cause devastation across the state as evacuation shelters have been hit with a highly contagious virus.