How Long Does the Flu Shot Last?
The effectiveness and duration of protection provided by the flu shot can vary from year to year due to the ever-evolving nature of influenza viruses. Generally, the flu shot is designed to provide immunity for a single flu season, which typically lasts from October to March. During this time, the vaccine helps the immune system recognize and combat prevalent strains of the influenza virus.
Read More - https://tech99.co/how-long-does-the-flu-shot-last/