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.

How does norovirus spread? What are common symptoms? And how can you keep from getting sick? Here’s what to know: What is norovirus? Norovirus is a “very contagious” virus t

Meanwhile, the agency urges faster testing for avian influenza A(H5N1) in hospitalized patients with suspected influenza.

Southern Californians are bracing for gusty winds and a heightened risk of wildfires less than two weeks after deadly blazes that have killed at least 27 people and ravaged thousands

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

Northwell Health partnered with Stacker to see which states have seen the biggest declines in senior health, using data from the CDC.

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

A child in San Francisco has tested positive for H5N1 bird flu after experiencing conjunctivitis and fever, health officials have confirmed. The young patient also tested positive for flu and RSV, according to local authorities.