What is the job of the immune system?

What can happen when germs invade the body?

The __________system keeps the body healthy.

_______________ can make you sick.

________ help fight germs.

A dangerous immune response to a safe substance happens in people with ________________.

___________are very small things that often cause infections.

An ________ occurs when a virus or microorganism enters the body.

An increase in body temperature when sick.

Common microscopic organisms.

The outer covering of the body.

Proteins that help get rid of infections.

A body system that works to keep the organism healthy.

A dangerous immune response to a safe substance.