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  2. Immune system - Wikipedia

    en.wikipedia.org/wiki/Immune_system

    Adaptive (or acquired) immunity creates an immunological memory leading to an enhanced response to subsequent encounters with that same pathogen. This process of acquired immunity is the basis of vaccination. Dysfunction of the immune system can cause autoimmune diseases, inflammatory diseases and cancer.

  3. Mathematical modelling of infectious diseases - Wikipedia

    en.wikipedia.org/wiki/Mathematical_modelling_of...

    Graph of herd immunity threshold vs basic reproduction number with selected diseases. S will be (1 − q), since q is the proportion of the population that is immune and q + S must equal one (since in this simplified model, everyone is either susceptible or immune). Then:

  4. Herd immunity - Wikipedia

    en.wikipedia.org/wiki/Herd_immunity

    An individual's immunity can be acquired via a natural infection or through artificial means, such as vaccination. [51] When a critical proportion of the population becomes immune, called the herd immunity threshold (HIT) or herd immunity level (HIL), the disease may no longer persist in the population, ceasing to be endemic .

  5. 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.

  6. EDITORIAL: Editorial encore: Natural vs. vaccine COVID immunity

    www.aol.com/news/editorial-editorial-encore...

    For more information on the new bivalent COVID-19 vaccine and where to get it, visit https://www.vaccines.gov /. There has been much debate about the efficacy of vaccine-induced immunity vs ...

  7. Infection - Wikipedia

    en.wikipedia.org/wiki/Infection

    Specific acquired immunity against infectious diseases may be mediated by antibodies and/or T lymphocytes. Immunity mediated by these two factors may be manifested by: a direct effect upon a pathogen, such as antibody-initiated complement-dependent bacteriolysis, opsonoization, phagocytosis and killing, as occurs for some bacteria,

  8. Respiratory virus activity is 'high' as cases increase in US: CDC

    www.aol.com/respiratory-virus-activity-high...

    Respiratory illness activity – a measure of how often conditions like the common cold, flu, COVID-19, and respiratory syncytial virus are diagnosed – is currently "high" in the United States ...

  9. Bird flu virus shows mutations in first severe human case in ...

    www.aol.com/news/bird-flu-virus-shows-mutations...

    The CDC said the patient's sample showed mutations in the hemagglutinin (HA) gene, the part of the virus that plays a key role in it attaching to host cells. The mutations seen in the patient are ...

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