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Giardia lamblia, an infectious protozoan. Protozoan infections are parasitic diseases caused by organisms formerly classified in the kingdom Protozoa. These organisms are now classified in the supergroups Excavata, Amoebozoa, Harosa (SAR supergroup), and Archaeplastida. They are usually contracted by either an insect vector or by contact with ...
Many protozoan pathogens are human parasites, causing serious diseases such as malaria, giardiasis, toxoplasmosis, and sleeping sickness. Some of these protozoa have two-phase life cycles, alternating between proliferative stages (e.g., trophozoites ) and resting cysts , enabling them to survive harsh conditions.
Human parasites include various protozoa and worms. Human parasites are divided into endoparasites, which cause infection inside the body, and ectoparasites, which ...
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 ...
Hyperparasites feed on another parasite, as exemplified by protozoa living in helminth parasites, [37] or facultative or obligate parasitoids whose hosts are either conventional parasites or parasitoids. [22] [33] Levels of parasitism beyond secondary also occur, especially among facultative parasitoids.
Parasites are organisms which derive sustenance from its host while causing it harm. [2] The study of parasites and parasitic diseases is known as parasitology. [3] Medical parasitology is concerned with three major groups of parasites: parasitic protozoa, helminths, and parasitic arthropods. [2]
Parasitic worms have been used as a medical treatment for various diseases, ... (pathogens can be viruses, bacteria, protozoa and helminths). [41]
This was the first protozoan parasite of humans that he recorded, and the first to be seen under a microscope. [ 6 ] A few years later, in 1687, the Italian biologists Giovanni Cosimo Bonomo and Diacinto Cestoni published that scabies is caused by the parasitic mite Sarcoptes scabiei , marking scabies as the first disease of humans with a known ...