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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]
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 29, the US suffered its first confirmed death of swine flu. On April 28, the Centers for Disease Control and Prevention had officially confirmed through tests that a 23-month-old child was infected with the flu. When the sickness continued to worsen the next day, he was transferred to Texas Children's Hospital in Houston, where he died.
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 ...
Kawaoka and his colleagues combined the H5 hemagglutinin gene from the bird flu virus with genes from the 2009 H1N1 swine flu virus. ... it arrived in North America in ... of Massachusetts Lowell.
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).
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.