Do you not understand the concept of a prescribed course of antibiotics? The rise of antibiotic-resistant strains of bacteria in the world is caused by bacteria that are only lightly dosed with an antibiotic and survives! When they do that in your body, you're still carrying around a version of the same sickness with a higher tolerance for what you were taking.
I truly cannot understand the mindset of otherwise intelligent people that only take part of a course of antibiotics. You're not killing them all! You're breeding them stronger! That's why they always have "Don't stop taking this just because you're feeling better" label on them.
Sigh.