Why Do They Become Resistant?
Antibiotic resistance evolves naturally. When an antibiotic is used, bacteria that can resist that antibiotic have a greater chance of survival than those that are susceptible. Susceptible bacteria are killed or inhibited by an antibiotic, resulting in a selective pressure for the survival of resistant strains of bacteria.
So, now we have antibiotic resistance (ABR) – in other words, antibiotic-resistant bacteria, or infections that cannot be treated using antibiotics. This resistance occurs when an antibiotic has lost its ability to effectively control or kill bacterial growth; in other words, the bacteria are ‘resistant’ and continue to multiply in the presence of therapeutic levels of an antibiotic. Human beings have overused antibiotics simply by harnessing them to treat all sorts of infections from pneumonia to strep throat – but also by infusing them into agricultural systems, animals, and food products.