To be mathematically precise. Finishing a course will not necessarily get every last bacteria. But there are really huge differences between 90%, 99%, 99.9%, 99.99%, and 99.999%. It is much better for oneself and everyone else that one gets as close to 100% as one can get by finishing the full course.
ETA: There is also a large difference in killing most but leaving enough bacteria to survive and grow and killing so many that there are too few to thrive and replicate.
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