Welcome to the State of California 

This Web page is no longer being maintained or updated; it is provided for historical purposes only. For current information on seasonal influenza (flu), see the California Department of Public Health Influenza Web page.

 On This Page

 H1N1 Flu Information

H1N1 Flu Information for the Public

Click to see full-size H1N1 Prevention PosterWhat is H1N1 Influenza?  H1N1 flu (2009 H1N1 Influenza virus) is a new influenza virus causing illness in people. This new virus was first detected in people in the United States in April 2009. This virus is spreading from person-to-person worldwide, in much the same way that regular seasonal influenza viruses spread. Most people who have become ill with this new virus have recovered without requiring medical treatment. Flu viruses are spread mainly from person to person through coughing or sneezing by people with influenza. Sometimes people may become infected by touching something (such as a surface or object) with flu viruses on it and then touching their mouth or nose.

Symptoms: The symptoms of H1N1 flu virus in people are similar to the symptoms of seasonal flu and include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills and fatigue. A significant number of people who have been infected with this virus also have reported diarrhea and vomiting. H1N1 Flu self-evaluation tool. Also, like seasonal flu, severe illnesses and death has occurred as a result of illness associated with this virus. Recommendations are available if you are caring for someone sick at home.

What can I do to protect myself and others from getting sick?

Get Vaccinated: H1N1 Flu Vaccine is arriving in increasing amounts, so now all Californians are encouraged to seek the H1N1 flu vaccine. Please visit our Vaccine Information and Vaccination Locations pages for information and locations where you can get vaccinated. Remember to get your seasonal flu shot this year. The seasonal flu vaccine does not protect against H1N1 flu, but it will help to prevent sickness and the spread of germs that cause respiratory illnesses like influenza.

Take these everyday steps to protect your health:

  • Cover your nose and mouth with a tissue when you cough or sneeze. Throw the tissue in the trash after you use it.
  • Wash your hands often with soap and water, especially after you cough or sneeze. Alcohol-based hand cleaners are also effective.
  • Avoid touching your eyes, nose or mouth. Germs spread this way.
  • Try to avoid close contact with sick people.
  • Stay home if you are sick until you have been free of fever for at least 24 hours. This is to keep from infecting others and spreading the virus further.
  • Note: For travel information see Travelers and Travel Industries.

    Information From CDPH

  • Healthcast: CDPH Director Dr. Mark Horton talks about Your Flu Symptoms (MP3, 1.6MB)
    ...Transcript (PDF) Opens a new browser window.
  • Mensajes para tu salud: Dr. Gil Chávez habla acerca de los síntomas de la influenza (MP3, 2.4MB) 
    ...Transcripción (PDF)Opens a new browser window.
  • CDPH Recommendations for Cleaning Surfaces to Prevent H1N1 Transmission in Non-Healthcare Settings (PDF) - September 8 
  • Letter from Dr. Mark B. Horton to Californians on Upcoming Flu Season (PDF)Opens in a new browser window.... Spanish - August 25
  • Information From Federal Agencies

    Questions and Answers

  • What is H1N1 Flu?
  • What To Do if You Get Flu-Like Symptoms
  • Caring for Someone Sick at Home
  • Testing for Flu
  • Antiviral Drugs
  • Vaccination
  • Information about the H1N1 Flu Virus (Origin, News, Images, General Info)
  • Secondary Pneumococcal Infections
  • Mixing Tamiflu Capsules with Liquids for children who cannot swallow capsules
  • Questions and Answers About H1N1 Flu and Animals
  • Specific Groups

  • Parents and Caregivers
  • Child Care Programs
  • Day and Residential Camps
  • Deaf and Hard of Hearing
  • People at High Risk For Complications

  • Pregnant Women 
  • People with Asthma
  • People 65 Years and Older
  • People with Disabilities
  • People with HIV Infection
  • People with Cardiovascular Disease
  • People with Diabetes 
  • People with Inflammatory Arthritis or Rheumatic Disease
  • H1N1 Flu Multimedia Materials

    Brochures and Flyers

  • CDC H1N1 Flu Resources - brochures, flyers, and more
  • Brochure: "2009 H1N1 Flu and You
  • Brochure - Seasonal and Novel H1N1 Flu: A Guide for Parents (PDF) Opens in a new browser window.
  • Flyer - Seasonal and Novel H1N1 Flu: A Guide for Parents (PDF) Opens in a new browser window.
  • Brochure - CDC Says "Take 3" Steps To Fight The Flu (PDF) Opens in a new browser window.
  • Flyer - 2009 H1N1 and Seasonal Flu: What To Do If You Get Sick (PDF) Opens in a new browser window. 
  • Factsheet - What You Should Know About Flu Antiviral Drugs (PDF)
  • Audio and Video

  • H1N1 Flu Audio and Video Resources   
  • Background Information on "Swine Flu"

  • H1N1 in Animals (Pets, Swine, Birds, and Other Animals)
  • Swine Influenza in Pigs and People - CDC brochure
  • Key Facts about Swine Influenza (Swine Flu) - CDC
  • 2009 H1N1 Influenza A Virus Information - ARS, USDA
  • Surveillance for Influenza Virus in Pigs - APHIS, USDA

    Last modified on: 8/25/2011 1:59 PM