Transcript

NARRATOR

How many bacteria live on our hands? Here, a man briefly places his unwashed hand on a dish of nutrient gel. You can see a faint hand print where the surface of the gel has been disturbed. Watch what happens when the plate is kept warm at body temperature. Colonies of bacteria develop in just a few hours most of these bacteria are harmless organisms commonly found on our skin, but unwashed hands readily transmit pathogenic bacteria and viruses from person to person and from hand to mouth.