If you take only part of the course, then there is a much higher likelihood that you have killed enough of the bacteria that you no longer feel the symptoms but there are plenty of that bacteria still alive in your body. The bacteria that survive will learn how to deal with the antibiotic and then when they reproduce it will be more likely to be resistant to it in the future. Imagine this happening in many peoples bodies across the population for years and as they share germs you end up with strains of the bacteria that are now resistant to antibiotics. This is how you get superbugs in the first place. (Or more accurately, its a contributing reason).
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