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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]
On April 28, 2009, the director of the Centers for Disease Control and Prevention confirmed the first official US death of swine flu. Tests confirmed that a 23-month-old toddler from Mexico, who was probably infected there, died on April 27 from the flu while visiting Texas. [138]
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 CDC discontinued reporting of individual confirmed and probable cases of novel H1N1 infection on July 24, 2009. The CDC will report the total number of hospitalizations and deaths weekly, and continue to use its traditional surveillance systems to track the progress of the novel H1N1 flu outbreak. [119]
In 2009, H1N1 caused the first global flu pandemic in 40 years, with the first infections detected in California. More than 12,000 people died around the US, and nearly 61,000 people were infected.
It happened again in 2009, when a human and swine flu switched genes, unleashing the H1N1 swine flu outbreak that killed roughly 500,000 people. Already there is evidence this virus is swapping genes.
On May 19, 2009, a St. Louis County man became the first death in Missouri due to the Swine Flu. As of mid-May 2009 many states had abandoned testing for likely influenza cases unless serious illness and/or hospitalization were present. [ 32 ]
Even as the United States grapples with an outbreak of H5N1 flu in dairy cattle, the World Health Organization has announced the first known human infection with a different strain, H5N2, in a ...