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Across 1. Showing signs of infection 4. Physical and romantic attraction to people of the same gender 6. Infectious agent that replicates only within the cells of living hosts 8. Causing or capable of causing death 11. A system in the body that fights and kills bacteria, viruses, and foreign cells 14. Under the skin or into a vein with a needle and syringe 16. Pneumocystis carinii pneumonia 17. Acquired immunodeficiency syndrome 18. Physical and romantic attraction to people of more than one gender

Down 1. Development of detectable antibodies to HIV in the blood as a result of infection with HIV 2. Human immunodeficiency virus—the virus shown to cause AIDS. 3. Influenza 5. Showing no outward sign of infection, not feeling sick 7. Can go from one person to another and so on 9. self-restraint, forbearance 10. The type of virus that stores its genetic information in a single-stranded RNA molecule 12. An enzyme that triggers the breakdown of proteins 13. illness; sickness; ailment 15. Kaposi's sarcoma