First cases of flu hit Bay Area, marking start of a dangerous season ahead San Francisco ChronicleSouth Bay Health Officials Message to the Public: Get a Flu Shot KPIX CBS SF Bay AreaEarly Signs You're Catching the Flu Yahoo LifestyleA fall 'twindemic'? As US nears 200,000 coronavirus deaths, experts fear COVID-19, flu may be a deadly combo USA TODAYSanta Clara County opens free walk-up flu shot clinic KRON4View Full Coverage on Google News