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What is the role of the antibiotic in creating resistance?

When an antibiotic is used, bacteria that can resist that antibiotic have a greater chance of survival than those that are ‘susceptible’. Those bacteria that survive, can then multiply. Some resistance occurs without human action, as bacteria can produce and use antibiotics against other bacteria, leading to a low-level of natural selection for resistance to antibiotics. However, the current higher-levels of antibiotic-resistant bacteria that are found in both human and veterinary medicine are attributed to the overuse and abuse of antibiotics.