>And as to mutation, you're right, they don't actually mutate. But what happens is the weaker bacteria/virus will not affect you but will affect your child. Aft

>And as to mutation, you're right, they don't actually mutate. But what happens is the weaker bacteria/virus will not affect you but will affect your child. After a while, the child starts to kill off the weaker ones and then the concentration of strong ones increase, and those are the ones that neither you nor your child can fight, and that's when adults get sick too. Source?