A pathological condition of a part, organ or system of an organism characterized by an identifiable group of symptoms
Disease
Something such as bacteria or a virus that causes disease.
Pathogen
A contagious disease caused by pathogens (flu, measles, malaria...)
Infectious diseases
A disease that is not caused by pathogens (cancer, Alzheimer...)
Noninfectious diseases
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
Allergy
A substance that produces an allergic reaction in someone.
Allergen
Begining suddenly and lasting for a short time (cold, flu)
Acute
Microorganisms (=very small living things) that consist of a single cell.
Bacteria
