Answer :
Bacteria resistant to antibiotics has increased because antibiotics were used so much that bacteria mutated (evolved) due to selective pressure (the antibiotic).
The percentage of resistant bacteria increased over time because bacteria to resist the action of some antibiotics due to the development of adaptation and resistance mechanisms, which is often a consequence of the misuse of antimicrobials.
What do antibiotics do to bacteria?
An antibiotic can be classified as bactericidal or bacteristatic. In the first case it works by directly killing the bacteria. In the second case, it prevents the bacteria from multiplying, allowing the sick person's own immune system to eliminate the infection.
When a bacterium acquires several mechanisms and becomes resistant to a huge variety of antibiotics, it becomes a superbug. Superbugs first gained prominence within hospitals, where the use of antibiotics is more intense and the transmission of bacteria is more efficient.
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