The adult human body is home to more than 100 trillion bacteria.
About 100 billion bacteria live on your skin.
The average human body contains 4lb of bacteria.
The human genome contains about 20,000 genes. The microbes inside us carry about 3.3 million.
In your large intestine alone, there are more than 1,000 bacterial species.
The human mouth can have up to 1,000 species.
Of the bacteria inside us, 99pc won't grow on laboratory petri dishes.
The least popular place for skin bacteria is behind the ear, where only 15 species typically settle.
Our bacterial mix is unique to each of us. Only 13pc of the species on two people’s hands are the same.
Bacteria from your forearm won’t survive on your forehead.