This 2019 illustration depicts a 3D computer-generated rendering of a whole influenza (flu) virus, rendered in semi-transparent blue, atop a white background. A transparent area in the center of the image, revealed the viral ribonucleoproteins (RNPs) inside. The RNPS were shown in white with their coiled structures, and three-bulbed polymerase complex on the ends. An influenza virus’ RNP is composed of both RNA and protein. Every influenza virus has eight RNP segments that correspond to the virus’ eight total gene segments. Three of these RNP segments encode the virus’ surface proteins, i.e., the HA, NA and M proteins. The virus’ hemagglutinin (HA) and neuraminidase (NA) surface proteins were displayed in semi-transparent blue, sticking out of the surface of the virus. HA is a trimer, comprised of three subunits, while NA is a tetramer, comprised of four subunits, with a head region resembling a 4-leaf clover. (Dan Higgins/CDC via Bay City News)

The state will start offering flu testing at its existing COVID-19 testing sites, the California Department of Public Health said Friday.

With flu transmission increasing steadily statewide alongside other respiratory viruses like COVID and respiratory syncytial virus, the CDPH said it will begin offering no-cost testing for the virus at the more than 100 state-run COVID testing sites across California.

People with flu symptoms can receive their results in roughly 30 minutes and, if positive, can then discuss potential antiviral treatment with their primary medical provider.

“Older adults, immunocompromised individuals, young children and pregnant persons are at highest risk for complications of respiratory viruses,” said state Public Health Officer and CDPH Director Dr. Tomas Aragon. “Getting the flu and COVID-19 vaccines beforehand, and treatment if you become ill, can help reduce severe illness.”

Testing sites can be found at Testing is available via appointment or on a walk-in basis.

People can also find information about COVID treatment and testing by calling the state’s COVID hotline at (833) 422-4255.