You know it makes me wonder if it really IS a poor immune system (with regards to the genetics)though. I don't see myself as having a poor immune system. I've only used Antibiotics once or twice over the last 14 years, and I rarely get colds or other sicknesses - just this annoying condition - candida! Maybe certain people are more likely to revert to a non acidic intestinal environment than others after taking Antibiotics or meds (as mentioned before by Hveragerthi). It's interesting. I wonder how many other people here have relatives who are also suffering.......