Spirochaetes are a kind of very small living thing that are shaped like a spring and can cause sickness in people and animals.
Spirochaetes are usually thought of as bad because they can make people and animals sick.
Examples:
The doctor looks at the spirochaetes under a microscope.
Some spirochaetes can make you very sick.
The spirochaetes move in a spiral shape.
The spirochaetes are like tiny springs in the body.
There are many different kinds of spirochaetes that can make you sick.
The spirochaetes are so small, you can't see them without a special tool.