Computer synthesis of bacteria (blue and green) on human skin. Many kinds of bacteria live on human skin, especially near sweat glands and hair follicles. Sometimes they can cause infection and form acne.

This is an enlarged picture showing a large number of cocci on the surface of a cell. Coccus refers to any type of circular bacteria. Every cocci is a complete life.

This is a computer-generated picture, showing Enterobacter tubular with three tails swimming around the human digestive tract.

This is a computer-generated picture of Streptococcus pneumoniae. This is one of the bacteria that cause pneumonia.