In order to see them we need a very powerful microscope. Germs that make us sick are called pathogens. There are three types of pathogens, bacteria, viruses, and sometimes fungi. We are made up of millions of cells. You can't see them with a normal microscope, you need an electron microscope to see them.
Viruses have many different shapes like teria.
There are many types of fungi which do not affect our health and our good for us. There are some types, though, that can be harmful to us. Our body has special defenses to prevent pathogens from making us sick. Skin- provides a natural barrier to prevent germs from entering into our body. The only time our skin doesn't protect us from us from germs is when we have cuts.