Pathogenic microbes

Pathogenic microbes are microbes that cause infectious diseases. This article is dedicated to human pathogenic microbes.
The organisms involved include pathogenic bacteria, causing diseases such as plague, tuberculosis and anthrax; protozoa, causing diseases such as malaria, sleeping sickness and toxoplasmosis; and also fungi causing diseases such as ringworm, candidiasis or histoplasmosis. However, other diseases such as influenza, yellow fever or AIDS are caused by pathogenic viruses, which are not living organisms and are not therefore microorganisms. As of 2007, no clear examples of archaean pathogens are known,although a relationship has been proposed between the presence of some methanogens and human periodontal disease.