Viruses are not like the other microbes. A virus is so tiny that it takes the highest-powered microscope just to see it. The smallest bacterium is larger than the biggest virus.
Viruses range from 20 to 400 thousandths of a millimetre across! Viruses are alive but they're not cells. They are just bundles of ‘instructions’ in a type of skin. They are the simplest of all living things.
