Across
- 1. A tiny organism that can only be seen with a microscope
- 6. A living organism that a pathogen infects
- 7. A mosquito-borne disease caused by parasites in the blood
- 12. The way a disease spreads from one source to another
- 14. Proteins made by the body to destroy specific pathogens
- 15. A substance that helps the immune system prepare to fight a disease
- 16. Actions taken to stop disease before it starts
- 18. Single-celled organisms; some release toxins that cause illness
- 19. Medicines used to treat bacterial infections
Down
- 2. Able to spread from person to person
- 3. Separating sick individuals to prevent the spread of disease
- 4. An organism that lives on or in a host and feeds off it
- 5. The body’s ability to fight off disease
- 8. When harmful germs enter and multiply in the body
- 9. Organisms with thick cell walls that can cause infections like ringworm
- 10. A deadly disease spread mainly by fleas on rats
- 11. A germ that causes disease
- 13. A contagious viral disease that causes a rash and fever
- 15. A nonliving particle that invades cells to reproduce
- 17. A bacterial disease that mainly affects the lungs