From what I remember reading, most bactrial infections are caused by gram positive bacteria, not gram negative. Regardless, I agree with Wilder that it is septcemia, which is symptom of a bacterial infection, not a specific bacteria.
I would recomend treating with Kanamyacin (aka Kanacyn, K-myacin) or tetracycline. These are broad spectrum antibioitcs. If you can't find either of these, then i would look for Eythromyacin (E-myacin, maracyn) and combine it with maracyn 2 (aka minocycline).
Good luck Austin