Published online by Cambridge University Press: 05 June 2014
Introduction
Mankind is afflicted with hundreds of parasitic diseases that affect every organ, including the upper and lower respiratory tracts. For some infections, man is the definitive host, i.e., the sexual or reproductive part of the parasite's life cycle takes place within the human body. For others, man is accidentally infected, i.e., humans interrupt another animal's parasitic life cycle. This latter scenario represents a dead end for the parasite, since reproduction is not possible.
The main groups of parasites are protozoa (single cell organisms) and helminths (worms). The taxonomic classifications and interrelations of these can be complex and are of little interest to most pathologists. Occasionally pentastome parasites, worm-like animals that inhabit the upper respiratory tract of reptiles, birds and mammals, also obstruct the upper airways. These are mentioned only briefly in this account, which focuses on the commoner lower respiratory tract protozoal and worm infections.
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