Pandemic and biological disasters

3. An organism in which a pathogen lives and reproduces.
7. Tiny particles released by coughing or sneezing that carry germs.
8. The presence of harmful substances or pathogens in food or water.
10. A microscopic organism, like a virus or bacterium, that causes disease.
12. The journey or process of a pathogen moving from one host to another.
13. An organism, typically an insect, that carries and transmits a pathogen.
14. Relating to the impact of a disease on the environment and ecosystems.
16. The insect vector responsible for transmitting the Black Death.
17. The rapid spread of an infectious disease within a specific region or community.
19. The total group of people affected by a disease in a territory.
20. Transmission where a pathogen travels via an intermediary like water or food.

1. Relating to the organs and processes involved in breathing.
2. A sudden increase in the occurrences of a disease in a particular place.
4. A contaminated inanimate object, like a doorknob, that can spread infection.
5. The spread of disease from a pregnant person to their fetus or baby.
6. A disease outbreak that spreads across multiple countries or continents.
9. A type of vector where the pathogen completes part of its life cycle inside it.
11. Transmission that occurs through physical contact with no intermediate step.
15. The body's natural defense response against a foreign pathogen.
18. The natural world or surroundings influenced by biological events.