Typically the symptoms (when they occur some people carry the bug without symptoms)tend to be upper GI (gastritis and ulcers) and the bug pretty much lives only in the upper GI, so does not tend to effect the colon.I think some people (because all the parts of the GI tract do talk to each other) find the IBS is better after getting rid of it, but that may be that the treatment for it (antibiotics) alters the colonic bacteria in a way that makes them better (and that is a #### shoot many people get much worse from antibiotics). The physcial stress of the infection could be making IBS worse like any other physical stress can make IBS worse (just like emotional stress can make it worse...stress is stress regardless of the cause).K.