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Across 5. a very infectious disease caused by bacteria spread mainly by fleas on rats or other animals, that causes swelling, fever, and usually death in humans 6. a medical condition that makes breathing difficult by causing the air passages to become narrow or blocked 7. a type of virus that causes diseases in humans and animals. In humans, it usually causes respiratory infections that are not serious, but can sometimes cause more serious infections that can kill people 8. a common infectious illness that causes fever and headache 9. a serious infectious disease that causes the tissues around the brain and spinal cord to swell

Down 1. a serious disease of the nervous system that can cause death 2. a disease caught during sexual activity with an infected person 3. severe continuous pain in the head, often with vomiting and difficulty in seeing 4. a large flow of blood from a damaged blood vessel 7. a common infection, especially in the nose and throat, that causes you to cough and sneeze and your nose to run