Imuune system

4. illnesses that spread from one person to another or from an animal to a person, or from a surface or a food
6. Chronic conditions that do not result from an (acute) infectious process and hence are “not communicable.
7. are part of the immune system and develop from stem cells in the bone marrow. They help protect the body from infection and may help fight cancer.
10. a widespread occurrence of an infectious disease over a whole country or the world at a particular time.
13. A complex network of cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases
15. The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases
16. a blood protein produced in response to and counteracting a specific antigen.
17. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
18. a very simple microorganism that infects cells and may cause disease.

1. a bacterium, virus, or other microorganism that can cause disease.
2. a person who studies or is an expert in the branch of medicine which deals with the incidence, distribution, and possible control of diseases.
3. A large group of single-cell microorganisms. Some cause infections and disease in animals and humans.
5. regularly occurring within an area or community.
8. is a type of white blood cell in the immune system of most vertebrates.
9. the presence of a virus in the immune system.
11. he state or quality of being resistant to a particular infectious disease or pathogen
12. A type of white blood cell that makes antibodies
14. a widespread occurrence of an infectious disease in a community at a particular time.