Medically reviewed by Alicen Nelson MD, MPH The navel, also known as the belly button or umbilicus, is a small, round, or ...

In one study, 60 volunteers swabbed their belly buttons. Researchers then analyzed the samples and found more than 2,300 kinds of bacteria. That's an average of 67 different kinds per belly button.

The team of researchers sequenced small fragments of each microbe’s genome to identify the diversity of microbes in each belly button. Each volunteer harbored an average of 67 different types of ...