Disease

What causes it? How do you get sick? Tell me what you think is a pathogen How do germs spread?

Disease Disease is an illness A communicable disease is a disease caused by pathogens A pathogen is a germ that causes disease There are 4 types of pathogen

Bacteria The smallest living things that can grow outside other living things Not animals or plants Split in 2 to make more of themselves Most common form of life on earth Grow in the air, water, and soil, or other living things Example: causes strep throat

Virus Enters a cell and takes control of it Causes cell to make more viruses. The viruses are copies of the original virus Cell bursts and releases the viruses Spreads to other cells Example: colds or warts

Fungi Plantlike living things that cannot make their own food, they are not plants Usually on your skin, in your intestines, and in your mouth Usually harmless Example: Ringworm

Protozoa Very simple one-celled animals Larger than bacteria Some cause disease