it hasn't been developed yet, we have treatments like chemotherapy, but we don't have an actual cure yet
but we do have vaccines that can prevent life-threatening diseases entirely
the covid vaccine is still not perfect but we can't wait until it is perfected
but for other ailments, we have perfected prevention systems
with most vaccines, the way they work is they inject a very small and very weak bit of the disease into the blood stream, and it helps the immune system learn how to get rid of it
it goes into the blood stream, and the white blood cells learn how to eliminate the invader