In the correct conditions (with warmth, moisture, nutrients) bacteria can multiply rapidly. The human body can provide these conditions for bacteria to multiply, for example in a cut. Each bacterium splits into two up to every 20 minutes.So, after one hour a single bacterium could have reproduced to give eight bacteria. microorganisms reproduce quickly in the human body.Page: 1  1. 2  2. 3  3.4  4.5  Back.n the correct conditions (with warmth, moisture, nutrients) bacteria can multiply rapidly. The human body can provide these conditions for bacteria to multiply, for example in a cut. Each bacterium splits into two up to every 20 minutes.