Infectious Diseases

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

Something such as bacteria or a virus that causes disease.

A substance that produces an allergic reaction in someone.

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

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

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

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.

Lasting for a long time (cancer, diabetes)

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

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