Seasonal influenza is an acute viral infection that spreads easily from person to person. Seasonal influenza viruses circulate worldwide and can affect people in any age group. … Seasonal influenza is a serious public health problem that causes severe illness and death in high risk populations.

Resources & Information

CDC Public Health Response to Severe Influenza – video

CDC Health Advisory on Seasonal Influenza A (H3N2)

CDC Patient Fact Sheet – What You Should Know About Flu Antiviral Drugs

CDPH Influenza (Flu) and Other Respiratory Diseases

CDPH Influenza Surveillance Program

CDPH Influenza Surveillance Program Weekly Report for December 17-23, 2017

CDPH Mandatory or Recommended Influenza Vaccination of Health Care Workers

CDPH Recommendations for Influenza and Other Respiratory Virus Testing and Reporting — 2017–2018

World Health Organization Fact Sheet – Influenza

News Articles

Flu Death Count in California Jumps Los Angeles Times January 19, 2018

Southern California hospitals grapple with flu patients — and one has set up a tent The Press Enterprise January 19, 2018

As flu cases surge, Bay Area hospitals work overtime San Francisco Chronicle January 18, 2017

CDC: Flu rises sharply, now widespread in 36 states CIDRAP News December 29, 2017