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2. 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.

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

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

   What are the different types of influenza virus? 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 ...

4. Influenza vaccine - Wikipedia

   en.wikipedia.org/wiki/Influenza_vaccine

   The effectiveness of seasonal flu vaccines varies significantly, with an estimated average efficacy of 50–60% against symptomatic disease, [92] depending on vaccine strain, age, prior immunity, and immune function, so vaccinated people can still contract influenza. [93]

5. Risk Factors for Severe Flu Doctors Want You to Know About - AOL

   www.aol.com/risk-factors-severe-flu-doctors...

   Cases of the flu are slowly ramping up across the country as we head into the holiday season. With that comes the risk of developing severe flu. The Centers for Disease Control and Prevention (CDC ...

6. How Late Is Too Late to Get the Flu Shot? Infectious Disease ...

   www.aol.com/too-flu-shot-infectious-disease...

   "It sounds mean to say it but that is a good thing, the fever and achiness is a marker of a nice brisk immune response and good, high-level immunity!" Related: These Are the 6 Vaccines Doctors Are ...

7. Polyvalent influenza vaccine - Wikipedia

   en.wikipedia.org/wiki/Polyvalent_influenza_vaccine

   Polyvalent influenza vaccine is a type of influenza vaccine that provides immunity against more than one type of antigen. [1] In the second week after receiving the flu shot, the body's immune system is triggered by the antigens so the body starts producing antibodies.

8. What to expect after you get a flu shot - AOL

   www.aol.com/lifestyle/expect-flu-shot-220800264.html

   Side effects don’t mean that the shot gave you the flu. Think of them more as a way to know your immune system is working. "The flu shot is a killed flu virus that consists of only half of the ...

9. 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.