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The influenza virus has caused several pandemic threats over the past century, including the pseudo-pandemic of 1947 (thought of as mild because although globally distributed, it caused relatively few deaths), [209] the 1976 swine flu outbreak and the 1977 Russian flu, all caused by the H1N1 subtype. [209]
The Centers for Disease Control and Prevention (CDC) identified the first two A/09(H1N1) swine flu cases in California on April 17, 2009, via the Border Infectious Disease Program, [135] for a San Diego County child, and a naval research facility studying a special diagnostic test, where influenza sample from the child from Imperial County was tested. [136]
The 1918–1920 flu pandemic, also known as the Great Influenza epidemic or by the common misnomer Spanish flu, was an exceptionally deadly global influenza pandemic caused by the H1N1 subtype of the influenza A virus.
The United States experienced the beginnings of a pandemic of a novel strain of the influenza A/H1N1 virus, commonly referred to as "swine flu", in the spring of 2009.The earliest reported cases in the US began appearing in late March 2009 in California, [114] then spreading to infect people in Texas, New York, and other states by mid-April. [115]
Dr. José Ángel Córdova Villalobos, Mexico's Secretariat of Health, stated that since March 2009, there have been over 1,995 suspected cases and 149 deaths, with 20 confirmed to be linked to a new swine influenza strain of Influenza A virus subtype H1N1.
The CDC reports the highest level of flu cases since the swine flu pandemic of 2009. For the first time, the death rate for flu cases is higher than the mortality rate for COVID-19.
The H1N1 virus was a concern in the months leading up to the 2010 FIFA World Cup, ... 274,304 hospitalizations, and 12,469 deaths in the US due to the virus.
The pandemic H1N1/09 virus is a swine origin influenza A virus subtype H1N1 strain that ... The death rate of H1N1 in the U.S. was calculated as less than 0.02% from ...