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Protists reproduce asexually or sexually. If the protists reproduce asexually, they do so through binary fission, multiple fission, budding, and fragmentation. If the protists reproduce sexually, they do so through a syngamy process where there is a fusion of the gametes. If this occurs in an individual it is recognized as autogamy.
For example, the human body louse transmits the bacterium Rickettsia prowazekii which causes epidemic typhus. Although invertebrate-transmitted diseases pose a particular threat on the continents of Africa, Asia and South America, there is one way of controlling invertebrate-borne diseases, which is by controlling the invertebrate vector.
Main article: Human parasite Endoparasites Protozoan organisms Common name of organism or disease Latin name (sorted) Body parts affected Diagnostic specimen Prevalence Source/Transmission (Reservoir/Vector) Granulomatous amoebic encephalitis and Acanthamoeba keratitis (eye infection) Acanthamoeba spp. eye, brain, skin culture worldwide contact lenses cleaned with contaminated tap water ...
The term continues to be used in a loose way to describe single-celled protists (that is, eukaryotes that are not animals, plants, or fungi) that feed by heterotrophy. [9] Traditional textbook examples of protozoa are Amoeba , Paramecium , Euglena and Trypanosoma .
Some protists are significant parasites of animals (e.g.; five species of the parasitic genus Plasmodium cause malaria in humans and many others cause similar diseases in other vertebrates), plants [182] [183] (the oomycete Phytophthora infestans causes late blight in potatoes) [184] or even of other protists.
Koch's postulates are used to establish causal relationships between microbial pathogens and diseases. Whereas meningitis can be caused by a variety of bacterial, viral, fungal, and parasitic pathogens, cholera is only caused by some strains of Vibrio cholerae. Additionally, some pathogens may only cause disease in hosts with an immunodeficiency.
A close relationship has been shown between Discicristata and Jakobida, [15] the latter having tubular cristae like most other protists, and hence were united under the taxon name Discoba, which was proposed for this supposedly monophyletic group. [1] Alternatively, the clade has been termed the jakobid, euglenazoan and heterolobosean group JEH ...
T. equiperdum, which causes dourine or covering sickness in horses and other Equidae, it can be spread through coitus. T. evansi, which causes one form of the disease surra in certain animals including camels [20] (a single case report of human infection in 2005 in India [21] was successfully treated with suramin [22]) T. everetti, in birds