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Giardia duodenalis, also known as Giardia intestinalis and Giardia lamblia, is a flagellated parasitic protozoan microorganism of the genus Giardia that colonizes the small intestine, causing a diarrheal condition known as giardiasis. [1] [2] [3] The parasite attaches to the intestinal epithelium by a ventral disc (syn.
About 40 species have been described, but most of them are probably synonyms. [11] Currently, five to six morphologically distinct species are recognised. [12] Giardia duodenalis (=G. intestinalis, =G. lamblia) infect humans and other mammals, G. microti infects voles, G. muris is found in other mammals, G. ardeae and G. psittaci in birds, and G. agilis in amphibians. [4]
Giardiasis is a parasitic disease caused by Giardia duodenalis (also known as G. lamblia and G. intestinalis). [3] Infected individuals who experience symptoms (about 10% have no symptoms) may have diarrhea, abdominal pain, and weight loss. [1] Less common symptoms include vomiting and blood in the stool. [1]
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 ...
A study found that the chlorination of water and nutritional intervention had no effect on childhood giardia infection. Only handwashing and hygienic sanitation interventions reduced infection rates in children. [6] Hexamita salmonis is a common flagellated fish pathogen. Infected fish are weak and emaciated, and typically swim on their sides.
The common intestinal parasite Giardia duodenalis (synonyms Giardia lamblia, G. intestinalis) was once considered to be a descendant of a protist lineage that predated the emergence of meiosis and sex. However, researchers found G. duodenalis to have a core set of genes that function in meiosis and that are widely present among sexual ...
Giardia lamblia is most common, but Entamoeba histolytica, Cryptosporidium spp., and other species have also been implicated. [13] [34] As a group, these agents comprise about 10% of cases in children. [24] [34] Giardia occurs more commonly in the developing world, but this type of illness can occur nearly everywhere. [36]
[1] [2] The group was first suggested by Simpson and Patterson in 1999 [3] [4] and the name latinized and assigned a rank by Thomas Cavalier-Smith in 2002. It contains a variety of free-living and symbiotic protists, and includes some important parasites of humans such as Giardia and Trichomonas . [ 5 ]