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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. 10 Places You’re Most Likely to Catch the Flu ... - AOL

   www.aol.com/10-places-most-likely-catch...

   Common flu symptoms include fever, coughing, fatigue, chills, and muscle aches, and complications can lead to life-threatening conditions like pneumonia. These alarming stats likely have you ...

4. Adaptive immune system - Wikipedia

   en.wikipedia.org/wiki/Adaptive_immune_system

   Immunity can be acquired either actively or passively. Immunity is acquired actively when a person is exposed to foreign substances and the immune system responds. Passive immunity is when antibodies are transferred from one host to another. Both actively acquired and passively acquired immunity can be obtained by natural or artificial means.

5. Common cold symptoms vs. flu or COVID: What to look for

   www.aol.com/common-cold-symptoms-vs-flu...

   When the weather starts to cool, a common question often arises: "Am I sick, or is it just allergies?" Here's what the experts say.

6. 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. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days.

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

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

   The common cold often shares many of the symptoms associated with COVID-19 or the flu but tends to be much milder. You may have a runny nose or congestion, sneezing, sore throat, cough, slight ...

8. What is the difference between COVID, RSV, the flu, and a ...

   www.aol.com/finance/nagging-cough-might-not...

   For the most part, symptoms have remained the same. Though there's talk of the variant possibly leading to more severe disease and additional GI symptoms like diarrhea, nothing has been confirmed.

9. 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,