Crossword puzzle on virus

2. A person or animal without apparent disease who harbours a specific infectious agent
6. Any departure, subjective or objective, from a state of physiological or psychological well-being.
7. The proportion of persons infected, after exposure to a causative agent, who then develop clinical disease.
11. Change in physiological status or in disease occurrence that conforms to a regular seasonal pattern.
12. The occurrence of more cases of disease than expected in a given area over a particular period.
13. A disease that is persistent, confined, and widespread within specific geographic boundaries
14. A long-term movement or change in frequency, usually upwards or downwards.
15. A disease that occurs infrequently and irregularly.

1. The proportion of persons with clinical disease, who after becoming infected, become severely ill or die.
3. Resistance developed in response to stimulus by an antigen
4. An epidemic occurring over a very wide area usually affects a large proportion of the population.
5. The number or proportion of cases or events or conditions in a given population.
8. A person or other living organism that can be infected by an infectious agent under natural conditions.
9. A factor, such as a micro-organism whose presence is essential for the occurrence of a disease.
10. The study of the distribution and determinants of health-related states