The flu is highly contagious. All it takes is for someone to cough or sneeze for the virus to spread.
Here at the top 3 ways you usually catch the flu.
The CDC says the flu virus can spread to other people up to 6 feet away. And you can pass the virus to someone before you even know you're sick.
"Somebody can be contagious with influenza up to a day prior to developing symptoms. Symptoms typically present as sneezing and coughing and so on, and up to 7 days post developing those symptoms, so the flu virus can be fairly contagious over a long period of time," says Dr. Assil Saleh, an internist.
Even though we're already into the flu season, it's not too late to get your shot. Doctors say that's the best way to protect yourself against this year's aggressive strain.
Also wash your hands often, stay home if you're sick, and use cleaning products to get rid of germs to minimize the risk.