Bacteria are really important microbes – life on earth couldn’t exist without them!  Bacteria have only one cell, shaped like a sphere, rod or spiral.  A single one, called a bacterium, is really tiny; millions would fit on the head of a pin!  Bacteria have been around for millions of years and they can live in any area of the earth, no matter how hot or cold.  Very few bacteria are harmful to you, most help to keep you healthy. 

Click on the links to find out how bacteria help you every day!