Swine Flu and You

October 20, 2009 1:00 PM ET

In The News

What percentage of hospitalizations for 2009 H1N1 flu occur in different age groups in the United States?

The percentage of hospitalizations for 2009 H1N1 flu in the United States varies by age group. From August 30, 2009 through October 10, 2009, states reported 4,958 laboratory-confirmed 2009 H1N1 hospitalizations to CDC. The percentage of 2009 H1N1 related hospitalizations that occurred among those 0 to 4 years old was 19%; among those 5 years to 18 years was 25%; among people 19 years to 24 years was 9%; among those 25 years to 49 years was 24%; among people 50 to 64 years was 15%; and among people 65 years and older was 7%. For a graphical representation of this data, please see the chart below.

What percentage of deaths for 2009 H1N1 flu occur in different age groups in the United States?

The percentage of deaths for 2009 H1N1 flu in the United States varies by age group. From August 30, 2009 through October 10, 2009, states reported 292 laboratory-confirmed 2009 H1N1 deaths to CDC. The percentage of 2009 H1N1 related deaths that occurred among people 0 years to 4 years was 3%; among those 5 years to 18 years was 14%; among people 19 to 24 years was 7%; among people 25 to 49 years was 33%; among people 50-64 years was 32%; and among people 65 years and older was 12%. For a graphical representation of this data, please see the chart below.

What is 2009 H1N1 (swine flu)?

2009 H1N1 (sometimes called "swine flu") 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, probably in much the same way that regular seasonal influenza viruses spread. On June 11, 2009, the World Health Organization (WHO) signaled that a pandemic of 2009 H1N1 flu was underway.

Why is 2009 H1N1 virus sometimes called "swine flu"?

This virus was originally referred to as "swine flu" because laboratory testing showed that many of the genes in this new virus were very similar to influenza viruses that normally occur in pigs (swine) in North America. But further study has shown that this new virus is very different from what normally circulates in North American pigs. It has two genes from flu viruses that normally circulate in pigs in Europe and Asia and bird (avian) genes and human genes. Scientists call this a "quadruple reassortant" virus.

2009 H1N1 Flu in Humans

Are there human infections with 2009 H1N1 virus in the U.S.?

Yes. Human infections with 2009 H1N1 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. This information is presented in a weekly report, called FluView.

Is 2009 H1N1 virus contagious?

The 2009 H1N1 virus is contagious and is spreading from human to human.