You might think some sensationalistic article which cites a study which approaches a subject completely out of context is a good reason to jump to conclusions void of any other factual information, sort of like an episode of Three's Company, "but you'd be wrong. Oh, boy, would you be wrong"

Exposure to relatively small (10,000 is small) amounts of bacteria can trigger a primary response from your immune system, allowing it to rapidly produce antibodies when needed.  At a later date, when you are exposed to the same bacteria under less desirable conditions (lack of sleep, poor nutrition, stress) this may prevent you from actually getting sick.

Context is everything.  Today the issue was merely double dipping, tomorrow it may be whether we go to war with someone or not.