There are many types of germs and they are everywhere. There are two types of germs that make us sick, bacteria and viruses. In both categories are thousands, but they all have 3 main shapes, rods, spheres, or spirals.
Visit CellsAlive site. It has numerous pictures of germs. Also visit this site's Diseases page where you can find out what diseases some germs can cause.
If a lot of the bad germs get in your body, you will get sick. Germs are already in your body, but some are supposed to be there. When these viruses and disease causing bacteria attack, you need to take antibiotics, ormedicine.
If someone coughs and doesn't cover their mouth, the germs will fly out on you and you will probably get the other person's germ. If they have a cold you could end up getting pneumonia.
If you don't wash your hands and then you put your hands in your mouth you will get sick. These bacteria are on food mostly the food that sits out for too long.