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Citation: Cox F. .

Key Concept Ranking

RNA Polymerase II
Trypanosoma brucei gambiense
Parasite Classification
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Comparison of the “traditional,” “1980,” and current classifications of the Protozoa

Generic image for table

Outline classification of parasitic protozoa and helminths that infect humans

Parasites in bold type are the most important species. Symbols: *, rare or very rare parasites of humans; +, accidental infections with larval forms and in which the parasite fails to develop to its adult stage.

This organism is also known as or . Molecular and epidemiological evidence now suggests that at least two assemblages of infect humans, one of which is and the other possibly a new species, ( ).

and are subspecies but are often referred to as species, and

Molecular phylogenetic studies of species indicate that humans also harbor a small number of parasites that cannot be identified as or for example, forms from Korea that resemble ovine babesias, a -like parasite from the United States, two as-yet-unclassified forms from Japan, and others from Brazil, Mexico, China, Taiwan, Egypt, and South Africa ( ).

a malaria parasite of macaque monkeys in Southeast Asia that occasionally infected humans in the past, has now been established as a naturally transmitted parasite of humans in Malaysia and other parts of Southeast Asia, where it has now caused a number of deaths ( ). now brings the number of human malaria parasites to five.

The designation is commonly used in the scientific literature, but it is now clear that this organism exists as a number of serotypes, and it has been recommended that all isolates from birds and mammals, including humans, should be in future designated as sp. serotypes ST1 to ST10 plus ST Unknown. Of these, all except ST5 and ST10 have been identified in humans, and all of these except ST9 are found in other hosts ( ).

The classification of the microsporidians is in a state of flux pending agreement as to how they should be classified within the fungi, so they are not assigned to any class or order in this classification.

Some zoologists have assigned certain species, including those found in humans, to other genera and but these genera have been largely ignored by medical parasitologists and, in order to avoid confusion, are not listed here.

Zoologists have assigned this worm commonly known as to the genus ( ), but this change has not been widely accepted by parasitologists working with human parasites.


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