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The G4 virus, also known as the "G4 swine flu virus" (G4) and "G4 EA H1N1", is a swine influenza virus strain discovered in China. [68] The virus is a variant genotype 4 (G4) Eurasian avian-like (EA) H1N1 virus that mainly affects pigs, but there is some evidence of it infecting people. [68]
Right now, the predominant strains circulating in the U.S. are flu A H1N1, flu A H3N2, and one influenza B strain. Over 95% of flu cases right now are influenza A, per the CDC.
The 2024-2025 flu shot protects against three strains — H3N2, H1N1 and a flu B strain — but uptake has been very poor this season, Dr. David Warren, chief of the division of infectious disease ...
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 two types of flu generally circulating now are H1N1 — related to the swine flu strain that caused a flu pandemic in 2009 and 2010 — and H3N2, ... Sign up for Essential California for news ...
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 previous high was during the H1N1 swine flu pandemic: 7.72% the week ended Oct. 24, 2009. ... New flu shots have arrived. Here’s the best time to get your annual vaccine.
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]