| A | B |
|---|
| Communicable disease | an illness caused by pathogens passed from one person to another; example- strep throat |
| virus | smallest living pathogens, not living; colds, measles |
| protozoa | single celled organisms; malaria, dysentery |
| fungi | single or multi-celled organisms; yeast mold; athlete's foot, ringworm |
| rickettsia | pathogens that are similiar to bacteria but multiply like viruses |
| mucous membranes | tissues that line the nose, mouth, and throat |
| phagocytes | white blood cell that finds, engulfs, and digests pathogens; scavenger cell |
| lymphocyte | white blood cell serves as a building block of the body's immune system |
| antigens | a substance that causes an immune reaction in the body |
| antibody | protein in blood that destroys or disables a specific antigen |
