How does flu start?
When you get the flu (influenza), it will often start with mild muscle aches, a slight tickle in the throat, or a worn-out feeling you just can’t shake.
Common wisdom suggests that if you treat flu when symptoms first appear, you may be able to shorten the duration and severity of the illness..
Where do viruses go after flu season?
The influenza A virus does not lie dormant during summer but migrates globally and mixes with other viral strains before returning to the Northern Hemisphere as a genetically different virus, according to biologists who say the finding settles a key debate on what the virus does during the summer off season when it is …
How many people died in the US from the flu in 2019?
CDC estimates that influenza was associated with more than 35.5 million illnesses, more than 16.5 million medical visits, 490,600 hospitalizations, and 34,200 deaths during the 2018–2019 influenza season.
Where does the flu originate each year?
Among their findings: seasonal flu originates in eastern and Southeast Asia. The result broadens previous hypotheses that such viruses emerged in China or exclusively in tropical regions.
Why does the flu come back every year?
These viruses spread seasonally each year because of a phenomenon known as antigenic drift: They evolve just enough to evade human immune systems, but not enough to develop into completely new versions of the virus. The H3N2 subtype causes the most disease each year.
Why does the flu come in winter?
The virus lives longer indoors in winter, because the air is less humid than outside. While it’s alive and in the air, it’s easy for people to inhale it, or for it to land on the eyes, nose, or mouth. We spend more time indoors and have closer contact with each other, which makes it easier for the virus to spread.