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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.
The effectiveness of seasonal flu vaccines varies significantly, with an estimated average efficacy of 50–60% against symptomatic disease, [91] depending on vaccine strain, age, prior immunity, and immune function, so vaccinated people can still contract influenza. [92]
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 ...
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.
Doctors explain how to recover from flu faster, including natural remedies, immunity-boosting foods, and more. ... “Multiple different components of the immune system, however, act to neutralize ...
It's flu season right now, and the U.S. is in the midst of a wave that's straining hospitals. But not all influenza is the same. There are some notable differences between flu A and flu B strains ...
Principles that govern the immune response can now be used in tailor-made vaccines against many noninfectious human diseases, such as cancers and autoimmune disorders. [177] For example, the experimental vaccine CYT006-AngQb has been investigated as a possible treatment for high blood pressure . [ 178 ]
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.