bacteria can evolve and become antibiotic-resistant
bacteria can develop random mutations. these can lead to changed in the bacteria's characteristics. this can lead to antibiotic-resistant strains forming as the gene for antibiotic resistance becomes more common in the population
MRSA is a relatively common superbug that is resistant to many antibiotics.
antibiotic resistance occurs when bacteria change so they no longer respond to antibiotics
to prevent antibiotic resistance occuring, it is important to: finish a full course of antibiotics ; only take antibiotics when prescribed and not overuse antibiotics