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It is now known that this was caused by an immunologically novel H1N1 subtype of influenza A. [43] The next pandemic took place in 1957, the "Asian flu", which was caused by a H2N2 subtype of the virus in which the genome segments coding for HA and NA appeared to have derived from avian influenza strains by reassortment, while the remainder of ...
Swine influenza (also known as swine flu or pig flu) is a respiratory disease that occurs in pigs that is caused by the Influenza A virus. Influenza viruses that are normally found in swine are known as swine influenza viruses (SIVs). The three main subtypes of SIV that circulate globally are A(H1N1), A(H1N2), and A(H3N2).
Only around 160 cases of the virus have been reported in the 40 years before 2018, mostly in various waterfowl or wild birds. [1] Existing studies show that H10 influenza viruses are present in a wide range of domestic and wild avian species, as well as in mammals, showing potential for adaptation. [2]
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.
Pigs can harbor influenza viruses adapted to humans and others that are adapted to birds, allowing the viruses to exchange genes and create a pandemic strain. A 2007 study reported: "In swine, three influenza A virus subtypes (H1N1, H3N2, and H1N2) are circulating throughout the world. In the United States, the classic H1N1 subtype was ...
There are four different types of influenza virus: A, B, C, and D. Influenza C usually causes only mild illness while D mostly affects animals, especially cattle.
This was the first flu pandemic to occur in the presence of a global surveillance system and laboratories able to study the novel influenza virus. [34] After the pandemic, H2N2 was the influenza A virus subtype responsible for seasonal influenza. [1]
The result: “56% of one community-obtained virus was similar to one component of the vaccine and 100% of a second flu virus was similar to a different vaccine component,” Dr. Shah says.
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