Answer:
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
I'm a bacteria that causes typhoid What's my name ?
Break it and it is better, immediately set and harder to break again.
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
I am rarely touched but often held. If you are smart you'll use me well. What am I?