Every animal, including man, is an unwilling host to one or more kinds of parasites. A number of these produce serious diseases. At the present time, more than 300 kinds of animal parasites have been described for man, and the list is constantly growing. By the term parasite is understood a living organism, which, for the purpose of obtaining food, takes its abode temporarily or permanently on or within other living organisms.
There are two great general divisions, vegetable, or phytoparasites, and animal, or zooparasites. While the phytoparasites offer a rich field for research and cause many serious diseases, they will not be considered in this paper. The zooparasites invade every organ, tissue and fluid of the human body. Their significance as an etiologic factor in disease is becoming more appreciated and understood.
There are ectoparasites, which live on external surfaces of the body or in cavities easily accessible from
McCLANAHAN HM. INTESTINAL PARASITES IN CHILDREN. JAMA. 1918;71(8):623–625. doi:https://doi.org/10.1001/jama.1918.02600340015004
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