ZN...in short, highly unlikely. I guess if you were allergic to Blue Gill fish, and a water snake had just like 30 seconds prior eaten a Blue Gill, and had little bits of Blue Gill scales stuck between its teeth, then I guess you could have issues. In any event, an allergic reaction looks nothing like systemic effects of envenomation. If your ED doc can't differentiate between the two, it's time to go back to school.