Across
- 4. A disease outbreak that spreads across many countries and continents
- 5. A face covering used to protect against disease
- 6. When a disease infects the body and causes symptoms
- 7. An extra vaccine dose given to strengthen immunity
Down
- 1. Proteins that attach to antigens and help destroy pathogens
- 2. Separating people who have contracted the illness to prevent them from spreading it
- 3. A substance that helps the immune system recognize and fight a disease without causing full illness