We have developed vaccines to repel invading microbes before they can establish themselves in our bodies and antibiotics to kill them in case they do.

Vaccines expose the body to weakened or killed versions of dangerous microbes. The immune system responds to the vaccine by building up an army of defenders. This army will then be ready to fight in case the full strength version of the microbes attack.

By attacking specific parts of microbes c their genes, their skin or elsewhere - antibiotics can kill them, or simply prevent them from reproducing. The bodys immune defenses can then mop up whats left. Antibiotics work primarily against bacteria.