Infectious Diseases

A pathological condition of a part, organ or system of an organism characterized by an identifiable group of symptoms

A substance that produces an allergic reaction in someone.

Microorganisms (=very small living things) that consist of a single cell.

Begining suddenly and lasting for a short time (cold, flu)

Something such as bacteria or a virus that causes disease.

A disease that is not caused by pathogens (cancer, Alzheimer...)

A simple living thing that is smaller than bacteria and that can enter your body and make you ill. If your body can protect itself against of it, then you are immune to it.

A contagious disease caused by pathogens (flu, measles, malaria...)

Lasting for a long time (cancer, diabetes)

A medical condition in which you become sick or your skin becomes covered with red marks as a reaction to something you eat, breathe, or touch