**how long does the flu shot last**  The flu shot, also known as the influenza vaccine, is a crucial preventive measure to protect against the seasonal flu virus. However, many people wonder, "**[how long does the flu shot last](https://tech99.co/how-long-does-the-flu-shot-last/)**?" The effectiveness of the flu shot can vary from season to season and person to person. Generally, the flu shot is designed to provide protection for one flu season, which typically spans from October to April. It's crucial to get a new flu shot every year because the influenza virus mutates frequently, and the vaccine is updated annually to match the prevalent strains. The peak protection from the flu shot usually occurs within two weeks after vaccination. While the vaccine's effectiveness can start to wane after several months, it still offers some level of protection throughout the flu season. Even if you receive the flu shot late in the season, it can provide valuable defense against the virus. Certain populations, such as young children, the elderly, and individuals with compromised immune systems, may have a shorter duration of protection from the flu shot. That's why healthcare professionals recommend annual vaccination for everyone aged six months and older. In summary, the flu shot lasts for one flu season and offers the best protection when received before the flu becomes widespread in your community. Getting vaccinated annually is the most effective way to reduce your risk of contracting and spreading the flu.