What Are The Flu Symptoms 2024. It's important to get the flu vaccine if you're advised to. Influenza (also known as “flu”) is a contagious respiratory illness caused by influenza viruses.
In general, flu season in the us lasts from october to as late as may, peaking between december and february. Get nhs advice on influenza (flu), including symptoms, how to treat it at home and when to seek medical advice.