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  2. The symptoms of influenza A and B can be identical, experts ...

    www.aol.com/news/symptoms-influenza-b-identical...

    It's flu season right now, and the U.S. is in the midst of a wave that's straining hospitals. But not all influenza is the same. There are some notable differences between flu A and flu B strains ...

  3. Pandemic H1N1/09 virus - Wikipedia

    en.wikipedia.org/wiki/Pandemic_H1N1/09_virus

    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.

  4. Influenza A vs. Influenza B: Which Flu Virus Is Worse? - AOL

    www.aol.com/influenza-vs-influenza-b-flu...

    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.

  5. Influenza A virus subtype H1N1 - Wikipedia

    en.wikipedia.org/wiki/Influenza_A_virus_subtype_H1N1

    The 1918 flu was an unusually severe and deadly strain of H1N1 [12] avian influenza, which killed from 17 [13] to 50 or more million people worldwide over about a year in 1918 and 1920. It was one of the deadliest pandemics in human history .

  6. How dangerous is flu? What to know about symptoms [Video] - AOL

    www.aol.com/news/dangerous-flu-know-symptoms...

    Influenza and pneumonia combined are the ninth leading cause of death in the U.S., killing tens of thousands of people a year, according to the CDC. Flu virus can raise heart attack risk

  7. 2009 swine flu pandemic - Wikipedia

    en.wikipedia.org/wiki/2009_swine_flu_pandemic

    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).

  8. Is it COVID-19, a cold or the flu? Your guide to seasonal ...

    www.aol.com/lifestyle/covid-19-flu-colds-back...

    Symptoms. COVID-19 often shares a lot of the same symptoms as influenza, including stuffy or runny nose, sore throat, cough, muscle aches, fatigue and fever or chills. But unlike the flu, COVID ...

  9. 2009 swine flu pandemic in the United States - Wikipedia

    en.wikipedia.org/wiki/2009_swine_flu_pandemic_in...

    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]

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