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The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu).
The pandemic H1N1/09 virus is a swine origin influenza A virus subtype H1N1 strain that was responsible for the 2009 swine flu pandemic. This strain is often called swine flu by the public media due to the prevailing belief that it originated in pigs. The virus is believed to have originated around September 2008 in central Mexico.
The G4 virus, also known as the "G4 swine flu virus" (G4) and "G4 EA H1N1", is a swine influenza virus strain discovered in China. [68] The virus is a variant genotype 4 (G4) Eurasian avian-like (EA) H1N1 virus that mainly affects pigs, but there is some evidence of it infecting people. [68]
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 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.
Nearly 8% of outpatient health care visits for respiratory illnesses are due to flu-like illness, which is the highest seen since the 2009-10 flu season, during the swine flu pandemic, data shows.
The World Organization for Animal Health called the swine killing "scientifically unjustified". [202] The first case of the H1N1 virus was discovered in Cairo, Egypt on 2 June 2009, in a 12-year-old girl coming from the US with her mother. Only the girl was infected and the officials caught the case before letting her out of the airport.
The World Health Organization has declared the influenza H1N1 pandemic over. "The world is no longer in phase 6 of influenza pandemic alert," WHO director Margaret Chan said in a statement. "We ...