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  2. Why does the flu make some people sick but not others? - AOL

    www.aol.com/lifestyle/why-does-flu-people-sick...

    Adults 65 years of age and older can have a weaker immune response to flu vaccines, making them more likely to get sick with the flu or get flu complications even when vaccinated, according to the ...

  3. Breakthrough infection - Wikipedia

    en.wikipedia.org/wiki/Breakthrough_infection

    A 2021 study found the common flu vaccine provided immunity to the flu in 58% of recipients. [6] The measles vaccine fails to provide immunity to 2% of children that receive the vaccine. However, if herd immunity exists, it typically prevents individuals who are ineffectively vaccinated from contracting the disease. [ 7 ]

  4. Influenza - Wikipedia

    en.wikipedia.org/wiki/Influenza

    Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses.Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue.

  5. Influenza vaccine - Wikipedia

    en.wikipedia.org/wiki/Influenza_vaccine

    There is a high-dose flu vaccine specifically formulated to provide a stronger immune response. [130] Available evidence indicates that vaccinating the elderly with the high-dose vaccine leads to a stronger immune response against influenza than the regular-dose vaccine.

  6. The 24-Hour Flu Is No Joke: Here’s What Causes It - AOL

    www.aol.com/24-hour-flu-no-joke-114000057.html

    The 24-hour flu is usually a type of gastroenteritis, which is an inflammation of the intestines and stomach, says William Schaffner, M.D., an infectious disease specialist and professor at the ...

  7. Treatment of influenza - Wikipedia

    en.wikipedia.org/wiki/Treatment_of_influenza

    Treatments for influenza include a range of medications and therapies that are used in response to disease influenza.Treatments may either directly target the influenza virus itself; or instead they may just offer relief to symptoms of the disease, while the body's own immune system works to recover from infection.

  8. Flu season - Wikipedia

    en.wikipedia.org/wiki/Flu_season

    Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere . It takes approximately two days to show symptoms.

  9. Original antigenic sin - Wikipedia

    en.wikipedia.org/wiki/Original_antigenic_sin

    The original antigenic sin: When the body first encounters an infection it produces effective antibodies against its dominant antigens and thus eliminates the infection. But when it encounters the same infection, at a later evolved stage, with a new dominant antigen, with the original antigen now being recessive, the immune system will still produce the former antibodies against this old "now ...