How Did Antibiotic Resistance Develop?

How Did Antibiotic Resistance Develop? Antibiotic use promotes development of antibiotic-resistant bacteria. Every time a person takes antibiotics, sensitive bacteria are killed, but resistant germs may be left to grow and multiply. Repeated and improper uses of antibiotics are primary causes of the increase in drug-resistant bacteria. How did antibiotic resistance start? Antibiotic resistance evolves