2009 swine flu pandemic in the United States information
Pandemic of a novel strain of influenza virus
Further information: 2009 swine flu pandemic, 2009 swine flu pandemic by country, and 2009 swine flu pandemic in the United States by state
Reported cases by state/territory
State or territory
State-reported confirmed cases[1]
State-reported hospital- izations[1]
Confirmed deaths
Total
115,318
27,632
3,433
Alabama
2,453/NLU[2]
NR
19[2]
Alaska
1,563[3][4]
18[3]wave 1
13[5] (11)[6]
Arizona
8,726[7]
1,897[7]
152[7]
Arkansas
154/NLU[8]
NR
53[9]
California
10,545[10]
8,589[10]
657
Colorado
1,321[11]
578[12]
70[12]
Connecticut
5,491[13]
766[13]
35[13]
Delaware
381[14][15]
NR
7[16]
District of Columbia
54[14]
NR
1[17]
Florida
3,676[18]
1,227[18]
230[19][20]
Georgia
1,012[21]
860[21]
81[22]
Hawaii
2,221[23]
NR
13[24]
Idaho
1,171[25]
389[25]wave 2
23[25]wave 2
Illinois
3,387[26]
3,042[27]
111[27]
Indiana
782[28]
NR
39[28]
Iowa
929[29]
700[30]
41[31]
Kansas
1,201[32]
NR
29[33]
Kentucky
2,092[34]
NR
39[34]
Louisiana
1,876[35]
NR
52[36]
Maine
2,232[37]
230[37]
21[38]
Maryland
1,772[39]
996[40]
45[41]
Massachusetts
1,979[42]
397[42]
33[43]
Michigan
655/NLU[44]
NR
88[45]
Minnesota
2,220[14]
1,813[46]
61[47]
Mississippi
1,292[48]
NR
26[49]
Missouri
1,523[50]
NR
17[51]
Montana
961[52]
9[52]
19[53]
Nebraska
430[54]
40[54]
15[55]
Nevada
5,516[56][57]
NR
44[56][58]
New Hampshire
722[59]
NR
10[60]
New Jersey
1,006/NLU[61]
512[62]
42[63]
New Mexico
1,007[64]
1,007[65]
58[66]
New York
2,738[14][67]
909[68]
206
North Carolina
638[69]
267[69]
107[70]
North Dakota
650[71]
60[71]
2[72]
Ohio
227/NLU[73]
NR
52[74]
Oklahoma
237/NLU[75]
7[75]
44[76]
Oregon
1,833[77]
1,419[77]
79[78]
Pennsylvania
10,940[79]
NR
78[79]
Rhode Island
203[80]
76[81]
13[82][83]
South Carolina
1,634[84]
NR
49[85]
South Dakota
2,081[86]
422[86]
23[86]
Tennessee
1,163[87]
NR
57[88]
Texas
6,128[89]
1,994[90]
231[91]
Utah
988[14]
302[92]
48[93]
Vermont
404[94]
149[94]
3[95]
Virginia
327[14][96]
NR
37[97]
Washington
1,882[14][98]
1,561[99]
99[99]
West Virginia
1,214[100]
853[101]
22[102]
Wisconsin
9,579[103]
1,317[103]
55[103]
Wyoming
725[104]
NR
10[105]
American Samoa
90[106]
NR
1[107]
Guam
338[108]
NR
2[109]
Northern Mariana Islands
71[110]
NR
0
Puerto Rico
908[111]
NR
60[112]
U.S. Virgin Islands
80[113]
NR
1[113]
NR: Not Reported - NLU: No Longer Updated
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t
e
The 2009 flu pandemic in the United States was caused by a novel strain of the Influenza A/H1N1 virus, commonly referred to as "swine flu", that was first detected on 15 April 2009.[114] While the 2009 H1N1 virus strain was commonly referred to as "swine flu", there is no evidence that it is endemic to pigs (i.e. actually a swine flu) or of transmission from pigs to people; instead, the virus spreads from person to person.[115]
On April 25, the World Health Organization declared a public health emergency, followed concurringly by the Obama administration on April 26.[114]
The U.S. Centers for Disease Control and Prevention (CDC) reported that during the outbreak about half of all influenza viruses being reported were 2009 H1N1 viruses, with the other half being those of the regular seasonal influenza. Unique to this particular strain, about 60% of the 2009 H1N1 influenza cases were occurring among people between 5 years and 24 years of age, and 40% of the hospitalizations were occurring among children and young adults. About 80% of the deaths were in people younger than 65 years of age. The CDC noted that this differed greatly from typical seasonal influenza epidemics, during which about 70% to 90% of deaths are estimated to occur in people 65 years and older. Antibody studies showed that children had no existing cross-reactive antibody to the 2009 H1N1 influenza virus, while about one-third of adults older than 60 years of age had cross-reactive antibody.[116]
By April 21, 2009, CDC had begun working to develop a virus that could be used to make a vaccine to protect against the new virus. Following preparation for distribution beginning in June, the first doses were administered in October 2009.[117]
On August 10, 2010, WHO declared an end to the global 2009 H1N1 influenza pandemic. However, the virus continues to circulate as a seasonal flu virus, and cause illness, hospitalization, and deaths worldwide every year.[118]
From April 12, 2009, to April 10, 2010, the CDC estimates there were 60.8 million cases (range: 43.3 - 89.3 million), 274,304 hospitalizations (range: 195,086 - 402,719), and 12,469 deaths (range: 8868 - 18,306) in the United States due to the virus.[119]
A follow-up study done in September 2010 showed that the risk of serious illness resulting from the 2009 H1N1 flu was no higher than that of the yearly seasonal flu.[120] For comparison, the CDC estimates the global H1N1 death toll at 284,000 and the WHO estimates that 250,000 to 500,000 people die of seasonal flu annually.[121]
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^ ab"H1N1 Flu" (archived version of dynamic web page). Alabama Department of Public Health. October 21, 2009. Reporting of aggregate statistics ended between 21 and 28 October, 2009 were "impractical because of the large number of people infected." (quote from this page version)
^ ab"Novel H1N1 Influenza (Swine Flu)" (archived version of dynamic webpage). Alaska Department of Health and Social Services. September 17, 2009. updated September 2, 2009 at 12:00 PM
^"Alaska Positive Rapid Tests For Influenza". Epidemiology. Alaska Department of Health and Social Services. Archived from the original on June 9, 2010. Retrieved March 2, 2014. ...(n=1,103)...from September 1, 2009 through April 6, 2010
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^"Alaska Laboratory-Confirmed Influenza Deaths by Week". Epidemiology. Alaska Department of Health and Social Services. Archived from the original on June 9, 2010. Retrieved March 2, 2014.
^ abc"Arizona - Weekly Influenze Summary: MMWR Week 25-26 (6/20/10 - 7/03/10)" (PDF). Arizona Department of Health Services. 2010. p. 4. Archived from the original (PDF) on October 2, 2010.
^"H1N1 Flu (Swine Flu) Resources". Arkansas Department of Health. July 29, 2009. Archived from the original on November 13, 2009.
^"State logs year's first flu death". Arkansas Democrat-Gazette. February 2, 2011. Retrieved April 6, 2022.
^ ab"Novel Influenza A (H1N1) Virus (Swine Flu) - Latest News". California - Department of Public Health. August 25, 2007. Retrieved August 27, 2009.
^"Influenza-Associated Hospitalizations by County by Diagnosis Date" (PDF). Colorado - Department of Public Health and Environment. August 30, 2009. Retrieved November 9, 2009.
^ ab"Department of Public Health and Environment |". www.colorado.gov.
^ abc"CTFLUWATCH" (continuously updated webpage). Connecticut Department of Public Health. October 19, 2010. Pandemic (H1N1) 2009 influenza A information for July 20, 2010
^ abcdefg"PAHO Influenza A(H1N1) Surveillance". PAHO. August 26, 2009. Retrieved August 26, 2009.
^No longer updating "H1N1 UPDATE - JUNE 18". Delaware - Department of Health and Social Services. June 18, 2009. Retrieved June 19, 2009.
^7th death in DE from H1N1 influenza - WGMD.COM
^"Drug-resistant swine flu reported in Va., Md" – via www.washingtonpost.com.
^ abUpdate each Wednesday "Swine Flu Information". Florida - Department of Health. July 30, 2009. Archived from the original on August 2, 2009.
^H1N1 Media Releases
^"Weekly County Influenza Activity" (PDF). Florida Department of Health. Archived from the original (PDF) on June 8, 2010.
^ ab"H1N1". Georgia - Division of Public Health. September 24, 2009. Retrieved September 24, 2009.
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^Delawareonline - Levi Johnston wants to be mayor; has no platform
^ abc"Idaho Case Counts". 2009 H1N1 Flu Surveillance Data. Idaho Department of Health & Welfare. Archived from the original on April 22, 2012.
^"Statistics" (archived version of dynamic web page). H1N1 flu. Illinois Department of Public Health. August 12, 2009. Retrieved March 2, 2014. Illinois Cases of H1N1 Flu by County (As of July 31, 2009, 10 a.m.)
^ ab"Statistics" (archived version of dynamic web page). H1N1 flu. Illinois Department of Public Health. May 8, 2010. Retrieved March 2, 2014. Confirmed H1N1 2009 Hospitalizations and Deaths (As of May 7, 2010, 10 a.m.)
^ ab "ISDH Press releases". Indiana - State Department of Health. August 20, 2009. Retrieved August 27, 2009.
^"Influenza and Other Respiratory Virus Weekly Activity Report" (PDF). Iowa - Department of Public Health. August 1, 2009. Retrieved August 26, 2009.
^"H1N1 vaccine plentiful in Iowa". www.newtondailynews.com.
^update at Monday"Kansas H1N1 Flu Virus Information". Kansas - Department of Health and Environment. August 24, 2009.
^Kansan dies from H1N1 - Pratt, KS - Pratt Tribune
^ ab"Flu Activity". Commonwealth of Kentucky. October 29, 2009.
^"DHH Updates Status of Fight the Flu Campaign". Louisiana - Department of Health & Hospitals. November 9, 2009. Retrieved November 9, 2009.
^Department of Health & Hospitals | State of Louisiana
^ abupdate weekly "Maine - H1N1 Influenza ("Swine Flu") Update". Maine - Center for Disease Control and Prevention. August 26, 2009. Retrieved August 27, 2009.
^"Maine Center for Disease Control & Prevention: DHHS - Maine". www.maine.gov.
^"Maryland weekly flu report". The Baltimore Sun. July 2, 2009. Retrieved July 2, 2009.
^Maryland Flu Watch
^Department of Health and Mental Hygiene Seasonal Influenza Preparedness Guide
^ ab"Confirmed H1N1 Influenza (swine flu)". Massachusetts - Department of Public Health. August 27, 2009.
^"Mass Public Health Blog | Promoting public health & wellness in Massachusetts".
^Daily Update of fatalities "MDCH-Influenza A (H1N1)". Michigan - Department of Community Health. June 13, 2009. Retrieved July 30, 2009.
^"Reports of flu-like illness in Michigan" (PDF). www.michigan.gov. 2010. Retrieved July 14, 2019.
^"Weekly Influenza Activity: Statistics". Minnesota - Department of Health. August 17, 2009.
^"Weekly Influenza and Respiratory Activity: Statistics - Minnesota Dept. of Health". www.health.state.mn.us.
^"Mississippi H1N1 Swine Flu Cases by County, 2009". Mississippi - State Department of Health. September 23, 2009.
^"Flu claims life of Lafayette County child". WTVA. March 19, 2009. Archived from the original on March 23, 2010.
^"Special Weekly Influenza Surveillance 2009-2010 Pre-Season Report, Missouri" (PDF). Missouri - Department of Health and Senior Services. August 22, 2009. Retrieved August 27, 2009.
^"Missouri health officials add up the H1N1 numbers". KMOX TV.[permanent dead link]
^ ab"Confirmed Novel Influenza A/H1N1 (Swine Flu)". Billings Gazette. August 6, 2009. Retrieved August 6, 2009.
^Missoulian, MICHAEL JAMISON of the. "Flathead County man dies of swine flu; 19th such death in Montana". missoulian.com.
^ ab"Influenza Report" (PDF). Week 34 (August, 29). Nebraska - Department of Health & Human Services. August 21, 2009. Retrieved August 27, 2009. [dead link]
^AP Health News Online Breaking News & Headlines from Associated Press - pennlive.com
^ ab"Nevada State Health Division Weekly Influenza Report". Nevada - State Health Division. August 21, 2009.
^Gibson, Tiffany (January 6, 2010). "Woman, 29, first H1N1 death in new year - Las Vegas Sun Newspaper". lasvegassun.com.
^"WEEKLY INFLUENZA SURVEILLANCE REPORT" (PDF). New Hampshire - Department of Health & Human Services. August 29, 2009. Retrieved September 16, 2009.
^NH reports 10th H1N1-related death » New Hampshire » EagleTribune.com, North Andover, MA
^"New Jersey Department of Health and Senior Services Communicable Disease Service Influenza Brief" (PDF). Week Ending August 29, 2009 (MMWR Week 34). Retrieved September 23, 2009.
^"H1N1 Flu Hospitalizations and Deaths in NJ". New Jersey DHSS. August 26, 2009. Retrieved August 27, 2009.
^Report, Staff (January 13, 2010). "Two New H1N1-Related Deaths Reported".
^Flu in New Mexico - Influenza Information
^New Mexico Analyzes Swine Flu | KDBC.com
^NM Department of Health Seasonal & H1N1Flu Information
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^"Health Alert #27" (PDF). New York City DHMH. July 8, 2009. Retrieved September 2, 2009.
^ abUpdate each Wednesday "NCPH: Influenza in N.C." North Carolina - Public Health. July 29, 2009. Retrieved July 30, 2009.
^North Carolina Influenza Sentinel Surveillance Program
^ abND Flu
^"Few flu cases reported this year". Bismarck Tribune.
^"Swine flu" (PDF). Ohio - Department of Health. July 30, 2009. Retrieved July 30, 2009.
^"Local death blamed on H1N1 virus". The Daily Standard.
^ abupdated on Mondays and Thursdays "Novel Influenza A H1N1 (Swine Flu) Daily Updates & Alerts". Oklahoma - State Department of Health. July 29, 2009.
^Swine flu death is 44th in Oklahoma | Tulsa World
^ abUpdate each Friday "H1N1 Influenza Update". Oregon - Department of Human Services. July 24, 2009. Retrieved July 30, 2009.
^"Oregon Health Authority : Prevent the flu by getting vaccinated each year : Flu Prevention : State of Oregon". www.oregon.gov.
^ abH1N1 in PA › PA Situation Update
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^"South Carolina Influenza Activity and Surveillance: 2008-2009 Season" (PDF). South Carolina - Department of Health and Environmental Control. June 13, 2009. Retrieved June 19, 2009.
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^ abc"South Dakota (A)H1N1 Surveillance". South Dakota - Department of Health. May 28, 2009. Retrieved June 5, 2009.
^"Sentinel Provider Influenza-Like Illness (ILI) Surveillance Summary" (PDF). Tennessee - Department of Health. November 21, 2009. Retrieved November 27, 2009.
^"Third wave of H1N1 could hit within the month". WVLT TV. February 8, 2010. Archived from the original on March 9, 2016.
^Update each Wednesday "Surveillance". Texas - Department of State Health Services. Retrieved October 24, 2009.
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^ ab"Novel H1N1 Flu (Swine Flu): Status Update". Vermont - Department of Health. June 24, 2009. Retrieved June 26, 2009.
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