| A | B |
| Disease | Any condition that negatively affects the normal functioning of the mind or body |
| Infectious disease | All diseases that are caused by the spread of germs |
| Pathogens | Germs or microorganisms that cause disease |
| Acute diseases | Those diseases that develop suddenly with symptoms that are often severe |
| Chronic disease | Diseases that develop gradually and may persist for years |
| Bacteria | One-celled tiny organisms that come in many shapes and grow everywhere |
| Fungi | Organisms that usually cause diseases of the skin |
| Virus | Responsible for more infections than any other pathogen |
| Allergen | A substance to which your body is particularly sensitive to |
| Antibodies | Special proteins produced by the lymphocytes |
| Process of infection | Pathogen; Host; Spreading; New Host |
| Incubation period | the most infectious time of the disease - hard to pinpoint because during the early stages of the disease |
| Ways germs can be spread | Direct contact; contact with objects; contact with animals |