Pathogen
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In biology, a pathogen, in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ.
A photomicrograph of a stool that has shigella dysentery. These bacteria typically cause foodborne illness.
Magnified 100× and stained. This photomicrograph of the brain tissue shows the presence of the prominent spongiotic changes in the cortex, with the loss of neurons in a case of a variant of Creutzfeldt-Jakob disease (vCJD)
Two pinworms next to a ruler, measuring 6 millimeters in length
Brown rot fungal disease on an apple. Brown rot typically target a variety of top-fruits.
Parasitic worm
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Parasitic worms, also known as helminths, are large macroparasites; adults can generally be seen with the naked eye. Many are intestinal worms that are soil-transmitted and infect the gastrointestinal tract. Other parasitic worms such as schistosomes reside in blood vessels.
Hookworms attached to the intestinal mucosa
Processed helminth eggs samples from a dry toilet in Kenya
Analysing for helminth eggs in samples of feces from a dry toilet in Kenya