Regarding statins -- sure there are side-effects, the most notable being liver dysfunction and myalgia. But let me cite you another famous study, the Scandinavian Simvastatin Survival Study (4S). The pertinents: 30% relative risk reduction in all-cause mortality and 42% relative risk reduction in coronary mortality (patients with angina or prior MI).
So please cite me some evidence for what you are saying, or stop spreading ridiculous misinformation.
As for your question, infection implies pathological invasion of the host. Otherwise you are merely colonized with the organism. For example, many people have MRSA present inside their nose, but that doesn't mean they are infected. And yes, you do have a symbiotic relationship with your bacteria, especially the skin and gut. Just have a look at wikipedia for lots of fun facts.