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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]
Influenza surveillance information on the 2009 H1N1 flu pandemic is available, but almost no studies attempted to estimate the total number of deaths attributable to H1N1 flu. Two studies were carried out by the CDC; the later of them estimated that between 7,070 and 13,930 deaths were attributable to H1N1 flu from April to 14 November 2009. [191]
In January 2010, the Connecticut CDC stated that there were 1,996 confirmed cases of A/H1N1 influenza in the first wave of the A/H1N1 influenza pandemic, and 3,386 confirmed cases of A/H1N1 influenza in the second wave of the A/H1N1 pandemic. 31 deaths from A/H1N1 were confirmed over the course of the pandemic. [180]
The season’s death toll of 199 matches the 2019-20 flu season, CDC said. The highest death toll recorded was 288 children who died from the flu in the 2009-10 season, at the height of the H1N1 ...
The highest number of deaths in children was 288 during the 2009-2010 season, which was during the height of the H1N1 swine flu pandemic. The CDC report also noted that flu vaccine use in children ...
Because reported numbers represented only confirmed cases, they were a "very great understatement" of the total number of cases of infection, according to the CDC. [320] From 12 April 2009 to 10 April 2010, CDC estimated there were 60.8 million cases, 274,304 hospitalizations, and 12,469 deaths in the US due to the virus. [321]
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.
From the Centers for Disease Control and Prevention page called "Disease Burden of Flu": "Each year CDC estimates the burden of influenza in the U.S. CDC uses modeling to estimate the number of flu illnesses, medical visits, hospitalizations, and deaths related to flu that occurred in a given season.