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.

CDC continues to take aggressive action to respond to an expanding outbreak caused by H1N1 (swine flu). CDC’s response goals are to reduce transmission and illness severity, and provide information to help health care providers, public health officials and the public address the challenges posed by this emergency.

CDC continues to issue and update interim guidance daily in response to the rapidly evolving situation. Early this morning, CDC provided interim guidance on school closures. Supplies from CDC’s Division of the Strategic National Stockpile (SNS) are being sent to all 50 states and U.S. territories to help them respond to the outbreak. In addition, the Federal Government and manufacturers have begun the process of developing a vaccine against this new 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

• April 30, 2009
• April 29, 2009
• April 28, 2009
• April 27, 2009
• April 26, 2009
• April 25, 2009
• April 24, 2009
• April 23, 2009