A spirochaete is a kind of very small living thing that is shaped like a spiral and can cause sickness in people and animals.
Spirochaetes are often thought of as bad because they can make people and animals sick.
Examples:
The spirochaete is a tiny thing that can make you sick.
Doctors study spirochaetes to learn how to stop them from making people sick.
The spirochaete is a very small living thing.
I don't want to get sick from a spirochaete!
There are many different kinds of spirochaetes that can make you sick.
The spirochaete is like a tiny spiral that can make you feel bad.