| A | B |
|---|
| toxin | a poison that can harm an organism |
| virus | package of nucleic acid wrapped in a protein coat that must use a host cell's machinery to reproduce itself |
| capsid | the outer covering of protein surrounding the nucleic acid of a virus |
| infectious disease | A disease that is caused by a pathogen and that can be spread from one individual to another. |
| resistance | the degree of unresponsiveness of a disease-causing microorganism to antibiotics or other drugs (as in penicillin-resistant bacteria) |
| vaccine | substance prepared from killed or weakened pathogens and introduced into a body to produce immunity |
| antibody | a substance produced by the body that destroys or inactivates a pathogen that has entered the body |
| antigen | substance (usually foreign) that stimulates the production of an antibody |
| antibiotic | compound that blocks the growth and reproduction of bacteria |
| fever | a rise in the temperature of the body |
| bacteriophage | virus that infects bacteria |
