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4. – The body's first line of defense against pathogens, which is non-specific.
5. – You enjoy crocheting.
9. – A sudden increase in the number of cases of a disease in a specific region.
10. – A microscopic pathogen that can infect living cells, causing diseases like flu or COVID-19.
12. – A method of stimulating the immune system to protect against specific diseases.
15. – A type of immune cell that helps recognize and kill infected cells.
16. – Immunity passed from mother to infant, or through antibody injections.
17. – Immune cells that produce antibodies to fight pathogens.
18. – The ability of the immune system to remember past infections.

1. – An organism that carries and transmits a pathogen.
2. – The immunity that develops after exposure to a pathogen, involving specialized cells.
3. – Single-celled organisms that can cause diseases like pneumonia or tuberculosis.
6. – The science of protecting and improving the health of communities.
7. – The body's reaction to harmful pathogens.
8. – An environment where pathogens live and multiply, often without causing disease.
11. – The process by which an infectious agent is spread.
13. – The microorganism responsible for causing a disease.
14. – Immunity developed after exposure to a pathogen or through vaccination.
16. – An outbreak of disease that spreads across countries or continents.
19. – When harmful microorganisms invade and multiply in the body.