Orange and Los Angeles counties are catching West Nile virus activity early in the season and urging residents to avoid ...

Six mosquitoes and three dead birds tested positive for the virus, according to the Sacramento-Yolo Mosquito and Vector Control District.

Add Yahoo as a preferred source to see more of our stories on Google. Crowds in the San Francisco Ferry Building on Saturday, March 7, 2026. A little-known respiratory virus, HMPV, is spreading in ...

The first human case of West Nile virus in Long Beach and current mosquito-carrying activity in the San Gabriel Valley has ...

A respiratory virus that doesn't have a vaccine or a specific treatment regimen is spreading in some parts of California—but there's no need to sound the alarm just yet, public health officials ...

Though it is commonly called the "winter vomiting disease," norovirus outbreaks are still cropping up around the country in late May.

The H5N1 strain of highly pathogenic avian influenza H5N1 has been detected in over 700 herds of dairy cows in California, the largest dairy-producing state in the U.S. A study published in PLOS ...

A passenger on an ill-fated cruise ship that docked in San Francisco after an outbreak of the highly contagious norovirus ...