Across
- 3. an organism that causes a disease
- 5. proteins produced by a type of white blood cells called lymphocytes
Down
- 1. a line of defense that helps us fight bacterias and viruses
- 2. an adjective describing how a disease may spread
- 3. an infectious disease that can cause spinal and respiratory paralysis
- 4. an immune cell that engulfs and destroys bacterias