Could My Persistent Diarrhea With A Burnt Smell, Bloating, And Gas Be Caused By An Infection?

I’ve been having some diarrhea that has been watery and has been going on for a week or so. It started off a black color and now has turned green with a sort of burnt smell to it. I haven’t had a fever or any other symptom expect bloating and gas. Could this be an infection of some sort?