- Communicable disease- a disease that is caused by the direct or indirect spread of pathogens from one person to another.
- Non-communicable disease- a disease that is not caused by pathogens and not transmitted through contact.
- Pathogen- tiny microorganisms that invade the body and attack its cells and tissues, including bacteria, parasites, fungi, and viruses.
- Prevention- practicing healthy habits to stay free of illness and disease.
- Disorder- normal function is impaired.
- Epidemic- sudden out break of disease that is more than expected.
- Pandemic- sudden geographically widespread outbreak of disease.
- Symptoms- observable changes in body functions that signal disease or illness.