Check out at least three viruses, one from a different letter of the alphabet. You can start with the A's, but be sure to scroll down for more. Now let's look at bacteria, another kind of germ. Bacteria are living things that are only one cell in size, and they don't have a nucleus. They are much larger than viruses, but you still need a powerful microscope to see them.
Some bacteria are useful to people, and there are bacteria that are harmful to people.
It's time to meet some bacteria. Let's check out Dennis Kunkel's Microscopy . Click on each page and scroll through the pictures of bacteria. You can also click on any photo to get a larger view of the bacteria. Remember, these photos were taken through a powerful microscope.