Many illnesses are caused by viruses or bacteria that, through mutations, can have altered DNA in subsequent generations. Occasionally, a mutated form will be resistant to an antibiotic or other agent designed to eliminate the virus or bacterium. If the antibiotic is being used, then only the mutated form will survive, and thus reproduce. This creates a strain that is resistant to a certain antibiotic.
The overuse of antibiotics can result in shorter development cycles for mutated forms that are resistant to those antibiotics. That is why the medical community is urging doctors to be careful about the overuse of certain antibiotics.
Antibacterial solutions can also cause this same phenomenon. You’ll notice, most antibacterial solutions will claim to kill “99.9% of germs”. Unfortunately that .1% of germs that survive will have withstood the antibacterial solution and go on to reproduce antibacterial-resistant strands. If you hear the term “superbug”, these sort of things is where that comes from.
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