Disease, An illness, Pathogen, A tiny germ that can make living things sick., Infectious disease, An illness caused by germs., Noninfectious disease, An illness that is NOT caused by germs., Communicable disease, An illness that can spread from one person to another., Noncommunicable disease, An illness that CANNOT spread from one person to another., Immune system, Your body's defense system that fights germs and helps keep you healthy., Virus, A tiny germ that needs living cells to grow and reproduce., Bacteria, Tiny living germs. Some are helpful, but some can make people sick., Protozoa and parasites, Tiny living things that can live on or inside another living thing and sometimes cause illnesses., Fungi, Living things like mold and yeast. Some can cause infections.

Diseases

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