Outnumbered by Alien Cells
Here's a startling fact to kick off with. Most of the cells in your body are not your own. In fact it has been estimated that there are ten bacterial cells for every one human cell. So what does that make us? Some kind of bacteria-human hybrid? Well, yes according to some scientists.
From the tips of your toes to the top of your head you are crawling with bacteria. They have you covered. They are on your skin, eyes, nose, inside your mouth and intestines and much more. Individual bacteria cannot be seen by the naked eye, but they often form colonies which can easily be spotted.
Inside the body there a plenty of havens for microbial life to survive and thrive. In your gut alone there are anywhere between 500 and 1000 species of bacteria. But don't panic! Many of these populations have roles that are important for human physiology and under normal circumstances do not have any harmful effects.
Mouth Bacteria: It's a Jungle in There
The Bugs that Lurk on Your Hands
Bacteria and the Roles they Play in the Human Body
Your Skin is Teeming with Microbes
Three Types of Helpful Bacteria
Meet Some Bacterial Good Guys