> If you’ve never been exposed to the flu, it’s possible to make a vaccine that teaches your immune system to look for those structures and attack them. But onc

> If you’ve never been exposed to the flu, it’s possible to make a vaccine that teaches your immune system to look for those structures and attack them. But once you’ve had the flu, your body obsesses over the strain that got you sick. That makes it really hard to get your immune system to look for the common structures. Very interesting, I did not know that.