smallpox

2. spread from one person or organism to another by direct or indirect contact.
4. an instance of invading a country or region with an armed force.
7. a mark left on the skin or within body tissue where a wound, burn, or sore has not healed completely and fibrous connective tissue has developed.
11. a person who comes to live permanently in a foreign country.
12. the manner in which someone behaves toward or deals with someone or something.

1. an acute contagious disease caused by the variola virus, a member of the orthopoxvirus family.
3. the number of live births per thousand of population per year.
5. treatment with a vaccine to produce immunity to a particular infectious disease or pathogen.
6. a person who has been forced to leave their country in order to escape war, persecution, or natural disaster.
8. a physical or mental feature which is regarded as indicating a condition of disease, particularly such a feature that is apparent to the patient.
9. the action or state of setting someone or something apart from others.
10. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.