A good bacteria is bad in one part of the body, while good and normal in other. For example, e coli in colon is not only normal, but essential. But e coli is the number one cause of food poisoning in the world. Another example, strep pneumonia is bad in throat, but normal in upper respiratory tract. so you see, thinking cs spares bacteria in one part of the body because it it's good there, but killing the same bacteria somewhere else because it causes disease is wishful thinking, in my opinion. It is just silver ions in water, after all right? I think some of these claims have no scientific basis and just pushed by sellers to entice gullible patients. I would much rather have them sell cs like a powerful antibiotic. Just eat a shit load of yogurt and kefir after you drink your cs.