2009 swine flu pandemic in the United States

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NR: Not Reported - NLU: No Longer Updated

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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