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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 H1N1 Flu Update: U.S. Human Cases of H1N1 Flu Infection

Novel Influenza A (H1N1) Cases by HHS Joint Field Office Coordination Groups
May 10, 2009, 11:00 AM ET

2532 Confirmed Cases in 44 States

H1N1 Confirmed Cases 05/10/2009

U.S. Human Cases of H1N1 Flu Infection
(As of May 10, 2009, 11:00 AM ET)
States* Laboratory
Alabama 4  
Arizona 182  
California 282  
Colorado 39  
Connecticut 24  
Delaware 44  
Florida 53  
Georgia 3  
Hawaii 6  
Idaho 1  
Illinois 466  
Indiana 39  
Iowa 43  
Kansas 36  
Kentucky** 3  
Louisiana 9  
Maine 4  
Maryland 23  
Massachusetts 88  
Michigan 114  
Minnesota 7  
Missouri 10  
Nebraska 13  
Nevada 9  
New Hampshire 4  
New Jersey 7  
New Mexico 30  
New York 190  
North Carolina 7  
Ohio 6  
Oklahoma 14  
Oregon 17  
Pennsylvania 10  
Rhode Island 7  
South Carolina 32  
South Dakota
Utah 63  
Washington 102 1
Washington, D.C. 4  
TOTAL*(44) 2532 cases 3 deaths

International Human Cases of Swine Flu Infection
See: World Health Organization

*includes the District of Columbia

**one case is resident of KY but currently hospitalized in GA.

NOTE: Because of daily reporting deadlines, the state totals reported by CDC may not always be consistent with those reported by state health departments. If there is a discrepancy between these two counts, data from the state health departments should be used as the most accurate number.

The ongoing outbreak of novel influenza A (H1N1) continues to expand in the United States. 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 the expanding outbreak. CDC’s response goals are to reduce spread 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 is issuing updated interim guidance daily in response to the rapidly evolving situation.

School Guidance

This includes updated interim guidance for schools and childcare facilities on preventing the spread of novel influenza A (H1N1) virus. At this time, CDC recommends the primary means to reduce spread of influenza in schools focus on early identification of ill students and staff, staying home when sick, and good cough etiquette and frequent hand washing. Decisions about school closure should be at the discretion of local authorities based on local considerations.

Increased Testing

CDC has developed a PCR diagnostic test kit to detect this novel H1N1 virus and has now distributed test kits to all states in the U.S. and Puerto Rico. The test kits are being shipped internationally as well. This will allow states and other countries to test for this new virus. This increase in testing capacity is likely to result in an increase in the number of reported confirmed cases in this country, which should provide a more accurate picture of the burden of disease in the United States.

More on the Situation

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