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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.
Influenza-like illness (ILI), also known as flu-like syndrome or flu-like symptoms, is a medical diagnosis of possible influenza or other illness causing a set of common symptoms. These include fever, shivering , chills , malaise , dry cough , loss of appetite , body aches, nausea , and sneezing typically in connection with a sudden onset of ...
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 ...
[18] [19] [20] Influenza (flu) is more severe in the elderly than in younger age groups, but influenza vaccines lack effectiveness in this demographic due to a waning of the immune system with age. [ 7 ] [ 21 ] The prioritization of school-age children for seasonal flu immunization, which is more effective than vaccinating the elderly, however ...
What you can do about it. Everyone ages 6 months old and up is eligible for the influenza vaccine, which is reformulated each year to better combat the strain of flu that’s circulating that season.
Flu season is officially upon us and cases are expected to jump across the country any day now. With that, questions about how to recover from the flu faster are already popping up.
Innate immune defenses are non-specific, meaning these systems respond to pathogens in a generic way. [19] This system does not confer long-lasting immunity against a pathogen. The innate immune system is the dominant system of host defense in most organisms, [ 2 ] and the only one in plants.
Mechanisms underlying the cause of reactogenicity symptoms. In clinical trials, reactogenicity is the capacity of a vaccine to produce common, "expected" adverse reactions, especially excessive immunological responses and associated signs and symptoms, including fever and sore arm at the injection site.