What is H1N1?

H1N1 (referred to as "swine flu" early on) is a new influenza virus causing illness in people. It was first detected in humans in the United States in April 2009. Other countries, including Mexico and Canada, have reported people sick with the new virus. The virus is spreading from person-to-person, probably in much the same way that regular seasonal influenza viruses spread.

Are there human infections with novel H1N1 virus in the U.S.?

Yes. Human infections with the new H1N1 virus are ongoing in the United States. Most people who have become ill with this new virus have recovered without requiring medical treatment. CDC routinely works with states to collect, compile and analyze information about influenza, and has done the same for the new H1N1 virus since the beginning of the outbreak.

What are the signs and symptoms of the H1N1 virus in people?

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. Also, like seasonal flu, severe illnesses and death have occurred as a result of illness associated with the virus.

How does H1N1 virus spread?

Spread of H1N1 virus is thought to be happening in the same way that seasonal flu spreads. 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 with flu viruses on it and then touching their mouth or nose.

How long can an infected person spread this virus to others?

At the current time, the Centers for Disease Control and Prevention (CDC) believe that this virus has the same properties in terms of spread as seasonal flu viruses. With seasonal flu, studies have shown that people may be contagious from one day before they develop symptoms to up to 7 days after they get sick. Children, especially younger children, might potentially be contagious for longer periods. CDC is studying the virus and its capabilities to try to learn more and will provide more information as it becomes available.

Is there a vaccine for H1N1?

The CDC is working on a vaccine, however there is no vaccine available right now to protect against H1N1 virus. Even though there is no vaccine, there are everyday actions that can help prevent the spread of germs that cause respiratory illnesses like influenza.

Centers for Disease Control and Prevention. H1N1 Flu. http://www.cdc.gov/h1n1flu/qa.htm, viewed on August 26th, 2009.