He's only had one exacerbation (H. Flu. which he has now kicked),and was on something else for it, so I think the Keflex is fine. He's only been on it one other time for a short period for something different. I'm well aware of the GI issues Strep can cause. My little guy has short bowel on top of CF, so we monitor him closely. He's still on IV fluids through a central line at night, so I bumped up his volume until he gets through this and wants to eat more again. He's not having any vomiting issues and seems a million times better already today. His fever is gone today and he's playing, unlike yesterday. I'm now the one feeling awful today...Ah the joys of passing illnesses around.