And most people have an immune system that take care of this along with cancer cells that are constantly made in our bodies and a whole of a lot of other microbes which are taken care of by working immune systems. We do this sort of thing all of our lives with many nasty things. If you dont constantly have some sort of Ab's running through your lymph system and blood there is something wrong with you. If you dont have a load of memory cells waiting to unleash a defensive response you most likely have not lived long enough or kept yourself in a bubble.