Isabella

1. The body's ability to remember past infections and respond more rapidly
5. The practice of protecting and improving the health of communities through education, policy, and research
8. A microorganism that can cause disease
10. The spread of an infection within a localized area
13. A type of cell that helps kill infected cells and directs immune responses
15. Transfer virus or bacteria
18. The body's ability to protect itself against harmful invaders
19. An organism that carries or hosts a pathogen without being affected
20. A tiny infectious agent that requires a living host cell to replicate and cause disease

2. Exposure to a pathogen or vaccination
3. The body's initial line of defense, like skin and mucous membranes
4. A type of cell that produces antibodies to fight off infections
6. I like snowboarding
7. Protective measure introduce pathogen in body
9. An organism, often an insect, that transmits a pathogen from one host to another
11. The invasion and multiplication of harmful microorganisms in the body
12. Person or Substance that makes dieases spread to other
14. Immune system's response to an infection or pathogen
16. A virus or bacteria that spreads across a large area or globally
17. Fighting infections by introducing antibodies