| A | B |
|---|
| Function of the Immune System | fight off disease and infections |
| Infectious diseases | diseases that are carried from person to person |
| What causes infections? | microbes (or sometimes even parasitic worms!) |
| bacteria | type of microbe |
| toxins | poisons |
| symptoms | signs of infections |
| contagious | "catching" - passed from person to person by direct contact |
| venereal diseases | "caught only by sexual contact |
| Sterile | germ free |
| First line of defense for your body | SKIN |
| second line of defense for your body | blood system (white blood cells) |
| Antibodies | chemical made by white blood cells |
| immune | you do not get sick, your body has antibodies to fight the infection |
| vaccine | a shot to make you immune to a certain disease |
