Rabies attacks the brain and spinal cord. It kills you if not prevented. The best way to prevent rabies is to make sure your pets get their rabies shots and to avoid contact with wild or stray animals. A virus is one of the smallest germs we know. Viruses are so tiny they can be seen only with a powerful microscope called an electron microscope.
Viruses appear to be shaped like balls, cubes, or rods.
Viruses cannot digest food or grow on their own. More than 300 viruses in animals have been discovered. Some are harmless and others cause disease, such as the common cold or measles. They enter the host cell. Once inside, the virus makes more viruses.