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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 flu shot may reduce your chances of contracting the virus, but more importantly, it reduces the risk of serious complications if you do get sick. ... heart or lung disease, a weakened immune ...
Another flu pandemic occurred in 1781–1782, starting in China in autumn. [68] From this pandemic, influenza became associated with sudden outbreaks of febrile illness. [77] The next flu pandemic was from 1830 to 1833, beginning in China in winter. This pandemic had a high attack rate, but the mortality rate was low. [34] [68]
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]
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 ...
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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.
Day 0. This is the period in which a person will have exposure and get infected with the virus. It's also called the incubation period. "The virus starts making copies of itself and infects the ...