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Basically when antiobiotic is given to patients, some bacteria change to overcome the effects of the antibiotic, and because of this, some bacteria change and mutate. Due to that those some will have genes that can withstand the effects of that particular antibiotic and than these bacteria have and advantage over the non resisant strains and they gradually survive and reproduce, they pass they genes onto their offspring.

One reason is that some patients stop taking the antibiotics when they start to feel better. You should always take all of the antibiotics prescripted to you. If you stop taking the antibiotics too early, the weakest bacteria have died but the strongest ones will survive and reproduce.

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13y ago

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