Flu is also a transmissible illness. It can spread from one person to another, mainly by droplets released when people with flu cough, sneeze, or talk. These then land in the mouths or noses of people nearby (usually within about 6 feet away) or are inhaled into the lungs.
That said, the best measure to take is wearing a well-fitted mask. As is known, face coverings or masks are a great way to help slow the spread of the virus that causes coronavirus disease. Similarly, wearing a mask might help protect you from the human influenza A and B viruses, which are responsible for most seasonal outbreaks of the flu.
