life expectancy declined in 2017 and 2018 due to flu and other viruses.
What is flu ?
Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs. Influenza is commonly called the flu.
How can influenza lead to death?
Flu can directly lead to death when the virus triggers severe inflammation in the lungs. When this happens, it can cause rapid respiratory failure because your lungs can't transport enough oxygen into the rest of your body.
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