Answer:
I'm a bacteria that causes typhoid What's my name ?
Walk on the living, they don’t even mumble. Walk on the dead, they mutter and grumble
I work when I play and play when I work.
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
You can only have it once you have given it.
You use it between your head and your toes, the more it works the thinner it grows.