What are Infectious Diseases?
Infectious diseases are diseases caused by microorganisms. Consider fungi, viruses, bacteria and parasites. Infectious diseases come in different forms. There are a large number of harmless infectious diseases, but there are also dangerous infectious diseases. Some you can even die from.
One can contract an infectious disease by breathing contaminated air, or by ingesting contaminated solid or liquid food, by having been in contact with an infected person, or by exposure to infected insects.
Not only humans can contract an infectious disease, but also animals. This infectious disease can be caused by a fungus, bacteria or virus.