How many microbes live on a body over an average lifetime?

22nd July 2009

Asked by: FOCUS

Estimates of the bacterial population on your skin range from 1500 to 100,000 per cm2. This gives a conservative population size of 50 million bacteria for the whole body. These could divide every 20 minutes in ideal conditions so you might play host to over a 100 trillion bacteria on your skin over your lifetime. There are 10 million times as many bacteria in your body as on your skin though.