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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.
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 ...
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]
In this case, a healthy immune system may have been a liability rather than an asset. [17] Preliminary research results from Taiwan also indicated this as the probable reason for many deaths during the SARS epidemic in 2003. [18] Human deaths from the bird flu H5N1 usually involve cytokine storms as well. [19]
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 ...
During the 2021-2022 flu season, the flu vaccine was about 36% effective, the CDC estimates. Year to year, numbers can vary widely because officials have to guess which kinds of flu viruses will ...
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.
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 ...