re: .

Antibiotic resistance is absolutely a real thing, but it's community-based, not individual based unless you're talking about a chronic infection that was inappropriately treated. The classic example of the latter is a little kid with an ear infection who gets antibiotics and starts to feel better but has another ear infection in the same ear a day or two after the antibiotics. There were some bacteria that needed a higher dose of antibiotics that lived. Then they grew, now all bacteria need more of the drug, or a different one. It can be applied to other scenarios as well, almost all with a "sick, not sick, sick" course that's within days to weeks. Even still, there are plenty of other antibiotic choices left for better coverage. Sounds like what happened is the doctor tried to put it in simpler terms that were easier to understand which wound up causing a misunderstanding, if I'm wagering. So maybe for whatever problem that required those antibiotics, she had a resistant strain, but that doesn't mean that she is "immune to antibiotics" in every instance. For some other infection, even the simple ones will probably do quite fine.