Flu vaccines teach the immune system to recognize the influenza virus and produce antibodies tailor-made to destroy it.
They contain altered influenza viruses that are either:
That way, when they’re injected into your body, they won’t make you sick.
But your immune system will see a threat and send different types of white blood cells to destroy the altered virus.
Certain immune system cells — B cells and killer T cells — will remember what the virus looks like.
B cells will also produce antibodies that specifically target the flu virus.
Helper T cell
Killer T cell
So, if the real virus gets into your body, the immune system will recognize it and destroy it.
Helper T Cell
Killer T Cell