Hospitals tend to be rather dangerous places to visit ; no wonder doctors are paid large amounts of money to stick around. If you're unlucky enough to spend a night in the hospital as a patient, you're going to expose yourself to bacteria that's been artificially hardened by antibiotics. All hospitals have their doses of MRSA (Methicillin-resistant Staphylococcus aureus), basically super bacteria that even the best immunologist can't kill (currently).
On the other side of the coin, lies the general impression that you absolutely HAVE to pop a pill of Tylenol (no, not antibiotics) or Aspirin for the slightest headache. When you actually take the time to visit a doctor for said pain, you're going to be walking out with a prescription for guess what... antibiotics !
Norway has shown that people actually need less antibiotics than they're prescribed. Limiting the usage of these drugs has caused fewer super mutants running around in their hospitals as well.
• Norwegian doctors prescribe fewer antibiotics than any other country, so people do not have a chance to develop resistance to them.