That only provides passive resistance and only lasts a short while.
It may also slow down the bodies development of its own antibodies which is so necessary against the virus and therefore place the person at risk for re-infection.
A vaccine provides long term immunity because it stimulates the body to create its own antibodies.
It may also slow down the bodies development of its own antibodies which is so necessary against the virus and therefore place the person at risk for re-infection.
A vaccine provides long term immunity because it stimulates the body to create its own antibodies.
Much better to get the actual disease, then one attains lifelong immunity, and doesn't suffer any of the side-effects of vaccination, such as auto-immune disease, retardation or death.