Content on this page was developed during the 2009-2010 H1N1 pandemic and has not been updated.

• The H1N1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide.
• The English language content on this website is being archived for historic and reference purposes only.
• For current, updated information on seasonal flu, including information about H1N1, see the CDC Seasonal Flu website.

The ongoing outbreak of novel influenza A (H1N1) continues to expand in the United States and internationally. CDC expects that more cases, more hospitalizations and more deaths from this outbreak will occur over the coming days and weeks.

CDC continues to take aggressive action to respond to an expanding outbreak caused by novel H1N1 flu.

CDC’s response goals are to:

1. Reduce transmission and illness severity, and
2. Provide information to help health care providers, public health officials and the public address the challenges posed by this emergency.

CDC is issuing updated interim guidance daily in response to the rapidly evolving situation. This includes updated interim guidance for clinicians on how to identify and care for people who are sick with novel H1N1 flu now that more widespread illness has been detected in the United States. CDC recommends that testing and antiviral treatment be prioritized for those with severe respiratory illness and those at highest risk of complications from seasonal influenza. This includes children younger than 5 years old, pregnant women, people with chronic medical conditions and weakened immune systems, and people 65 years and older. In addition, CDC has provided information for the public on what to do if they develop flu-like symptoms.

CDC has completed deployment of 25 percent of the supplies in the Strategic National Stockpile (SNS) to all states in the continental United States. These supplies and medicines will help states and U.S. territories respond to the outbreak. In addition, the Federal Government and manufacturers have begun the process of developing a vaccine against the novel H1N1 flu virus.

Response actions are aggressive, but they may vary across states and communities depending on local circumstances. Communities, businesses, places of worship, schools and individuals can all take action to slow the spread of this outbreak. People who are sick are urged to stay home from work or school and to avoid contact with others, except to seek medical care. This action can avoid spreading illness further.

Past Daily Updates

• May 4, 2009
• May 3, 2009
• May 2, 2009
• May 1, 2009
• April 30, 2009
• April 29, 2009
• April 28, 2009
• April 27, 2009
• more >>