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This new version is a concoction of 4 other flus: The North American Swine flu, Avian flu, Human flu, and another strain of Swine flu found in Asia and Europe.
It appears that this flu is spread human to human, but investigators are still checking for a direct swine to human contact.
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Swine flu infects people every year and is found typically in people who have been in contact with pigs, although there have been cases of person-to-person transmission.2 Symptoms include: fever, disorientation, stiffness of the joints, vomiting, and loss of conciousness ending in death.
In March and April 2009, more than 1,000 cases of swine flu in humans were detected in Mexico, and more than 80 deaths are suspected to have a connection with the virus. As of April 25, 2009 19:30 EDT there are 11 laboratory confirmed cases in the southwestern United States, New York City metropolitan area, and in Kansas.15 Following a series of reports of isolated cases of swine flu,1617 the first announcement of the outbreak in Mexico was documented on April 23, 2009. Some of the cases have been confirmed by the World Health Organization to be due to a new genetic strain of H1N1.1819 The new strain has been confirmed in 16 of the deaths and 44 others are being tested as of April 24, 2009.20 The Mexican fatalities are said to be mainly young adults, a hallmark of pandemic flu.21
The new strain appears to be a recombinant between two older strains. Preliminary genetic characterization found that the hemagglutinin (HA) gene was similar to that of swine flu viruses present in U.S. pigs since 1999, but the neuraminidase (NA) and matrix protein (M) genes resembled versions present in European swine flu isolates. Viruses with this genetic makeup had not previously been found to be circulating in humans or pigs, but there is no formal national surveillance system to determine what viruses are circulating in pigs in the U.S.22
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