Menlo Clinic - Affiliated with Stanford Hospital &  Clinics
Health Information

H1N1

What is 2009 H1N1 influenza?

2009 H1N1 influenza (also called Swine Flu) is caused by a new strain of influenza virus. It has spread to many countries. Like other flu viruses, 2009 H1N1 spreads from person to person through coughing, sneezing, and sometimes through touching objects contaminated with the virus. Signs of 2009 H1N1 can include:

• Fatigue

• Fever

• Sore Throat

• Muscle Aches

• Chills

• Coughing

• Sneezing

Some people also have diarrhea and vomiting. Most people feel better within a week. But some people get pneumonia or other serious illnesses. Some people have to be hospitalized and some die.

2009 H1N1 influenza vaccine

Vaccines are available to protect against 2009 H1N1 influenza.

• These vaccines are made just like seasonal flu vaccines.

• They are expected to be as safe and effective as seasonal flu vaccines.

• They will not prevent “influenza-like” illnesses caused by other viruses.

• They will not prevent seasonal flu.

You should also get seasonal influenza vaccine, if you want to be protected against seasonal flu. Inactivated (killed) vaccine is injected into the muscle, like the annual flu shot. This statement describes the inactivated vaccine. A live intranasal vaccine is also available.

For more information regarding the H1N1 please click on the link below.