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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]
According to the United States Centers for Disease Control and Prevention (CDC), in humans the symptoms of the 2009 "swine flu" H1N1 virus are similar to influenza and influenza-like illness. Symptoms include fever , cough , sore throat , watery eyes, body aches, shortness of breath, headache , weight loss, chills , sneezing, runny nose ...
Initial reports of atypical flu in two individuals in southern California led to the discovery of the novel swine flu virus by the CDC in mid-April. More than a hundred cases were confirmed in the next two weeks, spread through a dozen states. [20]
The numbers from state authorities are often out of synch with those in the CDC daily report, primarily because the CDC updates its figures less frequently. For instance, the Illinois Department of Public Health updated the number of confirmed cases in Illinois to 225 at 10 a.m. CT on May 6, 2009, [ 115 ] while the CDC update at 11:00 AM ET ...
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]
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.
The virus is a novel strain of the influenza virus, [2] for which existing vaccines against seasonal flu provided no protection. A study at the U.S. Centers for Disease Control and Prevention (CDC) published in May 2009 found that children had no preexisting immunity to the new strain but that adults, particularly those over 60, had some degree of immunity.
In recent years, the CDC estimates, people 65 and older have represented 70% to 85% of seasonal-flu-related deaths and 50% to 70% of seasonal-flu-related hospitalizations.
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