Book 1: 1 1.8 Changing Pathogens Some bacteria develop resistance to antibiotics so should use antibiotics properly, bacteria have natural mutation that means they aren't affected by the antibiotics. These mutations happen by chance producing new strains of bacteria by natural selection. More types of bacteria are becoming resistant to antibiotics making them more difficult to treat, over years antibiotics have been overused and used when they aren't really needed increases in rate at which antibiotic-resistant strains are being developed.

Antibiotic-resistant strains:
Normally antibiotic kills bacteria of non-resistant strains though individual resistant bacteria survive and reproduce so population of resistant bacteria increases. Antibiotics no longer used to treat non serious infections like mild throat infections which are often caused by viruses hopefully will slow down rate of development of resistant strains.
The process below occurring multiple times for different antibiotics means that bacteria develops resistance to many antibiotics

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Biology no. 1