Across
- 2. a microorganism that invades living cells to reproduce
- 3. the way a disease spreads from one host to another
- 4. a sudden outbreak of disease in one area or community
- 6. a substance that helps the body build immunity against a disease
- 7. single celled organisms, some cause disease
Down
- 1. isolation of people to prevent disease spread
- 5. an outbreak of disease that spreads across countries or continents
- 8. the invasion of an organism by pathogens