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Directly transmitted parasites, not requiring a vector to reach their hosts, include such parasites of terrestrial vertebrates as lice and mites; marine parasites such as copepods and cyamid amphipods; monogeneans; and many species of nematodes, fungi, protozoans, bacteria, and viruses. Whether endoparasites or ectoparasites, each has a single ...
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[citation needed] Parasites are organisms which derive sustenance from its host while causing it harm. [1] The study of parasites and parasitic diseases is known as parasitology. [2] Medical parasitology is concerned with three major groups of parasites: parasitic protozoa, helminths, and parasitic arthropods. [1]
The human botfly, Dermatobia hominis (Greek δέρμα, skin + βίος, life, and Latin hominis, of a human), is a species of botfly whose larvae parasitise humans (in addition to a wide range of other animals, including other primates [1]).
Rodent mite dermatitis (also known as rat mite dermatitis) is an often unrecognized ectoparasitosis occurring after human contact with haematophagous mesostigmatid mites that infest rodents, such as house mice, [1] rats [2] and hamsters. [3]
Plasmodium is a genus of unicellular eukaryotes that are obligate parasites of vertebrates and insects.The life cycles of Plasmodium species involve development in a blood-feeding insect host which then injects parasites into a vertebrate host during a blood meal.
Bacteria, viruses, and protozoan parasites from previous blood sources can survive within a leech for months, so leeches could potentially act as vectors of pathogens. Nevertheless, only a few cases of leeches transmitting pathogens to humans have been reported.
Pinworm infection spreads through human-to-human transmission, by swallowing infectious pinworm eggs. [18] [19] The eggs are hardy and can remain infectious in a moist environment for up to three weeks, [11] [18] though in a warm dry environment they usually last only 1–2 days. [20]
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