Giardia lamblia

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Gi·ar·di·a in·tes·ti·na·lis

a flattened, heart-shaped motile flagellated organism (10-20 mcm in length) with eight flagella; it attaches itself to the intestinal mucosa by means of a pair of sucking organs; in humans it is usually asymptomatic except in cases of heavy infection, when it may interfere with absorption of fats and produce flatulence, steatorrhea, bloating, and acute discomfort; it is the common species of Giardia in humans but is also found in pigs, dogs, cats and other mammals. In dogs and cats, it is commonly associated with bloating, flatulence, tenesmus, weight loss, and malodorous mucoid or bloody soft frothy voluminous stools; can have severe clinical course in young, sick or immunocompromised hosts. Chronic infestations may lead to debilitation. May be asymptomatic.
Synonym(s): Giardia lamblia

Giardia lamblia

A species of Giardia found in humans, transmitted by ingestion of cysts in fecally contaminated water or food. In current usage, the preferred name for G. lamblia is now G. duodenalis. These organisms are found worldwide. The most common symptoms of G. duodenalis infection are diarrhea, fever, cramps, anorexia, nausea, weakness, weight loss, abdominal distention, flatulence, greasy stools, belching, and vomiting. Onset of symptoms begins about 2 weeks after exposure; the disease may persist for up to 2 to 3 months.

There is no effective chemoprophylaxis for this disease. Metronidazole, quinacrine, or tinidazole are preferred treatments. See: water, emergency preparation of safe drinking


Cysts or trophozoites can be identified in feces. Three consecutive negative tests are required before the feces are considered to be negative. Duodenal contents also can be examined by aspiration or string test, in which an ordinary string is swallowed and allowed to remain in the duodenum long enough for the protozoa to attach. On removal, it is examined for the presence of cysts or trophozoites. A stool antigen assay test detects Giardia. This involves either immunofluorescence or enzyme-linked immunosorbent assay.

See also: Giardia

Giardia lamblia

A type of protozoa with a whiplike tail that infects the human intestinal tract, causing giardiasis. The protozoa will not spread to other parts of the body.
Mentioned in: Giardiasis


Alfred, French biologist, 1846-1908.
Giardia lamblia - protozoa which causes diarrhea and abdominal discomfort.
giardiasis - infection with Giardia.
References in periodicals archive ?
Bacteria Viruses Acinetobacter spp (3) Coxsackievirus (3) Campylobacter spp (12,13) enteroviruses (24) Chlamydia trachomatis (14,15) poliovirus (3) Enterobacter spp (3) rotavirus (11) Enterococcus spp (3) Parasites Escherichia coli O157:H7 (6,16-19) Cryptosporidium parvum (25) Helicobactor pylori (9) Endolimax nana (26) Klebsiella spp (3) Entamoeba coli (26) Proteus spp (3) Entamoeba histolytica (26) Psuedomonas spp (3) Giardia lamblia (5,27-29) Salmonella enteritidis (7,20) Isospora spp (26) Shigella sonnei (16,21,22) Sarcocystis spp (30) Staphylococcus aureus (22,23) Toxoplsma gondii (31) Streptococcus (22) Vibrio cholerae (10) Yersinia pseudotuberculosis (8) Table 2.
Dogs and other animals can be infected by giardia lamblia just like humans, and the disease can be readily transmitted through their infected fecal matter.
About Alinia Alinia for Oral Suspension (patients 1 year and older) and Alinia Tablets (patients 12 years and older) are indicated for the treatment of diarrhea caused by Giardia lamblia or Cryptosporidium parvum.
I need to know if you have a different protocol for detection for Giardia lamblia by PCR or any advice.
Another 10 diseases were listed as "occasionally" transmitted by food handlers: Campylobacter jejuni, Cryptosporidium parvum, Entamoeba histolytica, enterohemorrhagic Escherichia coli, enterotoxigenic Escherichia coli, Giardia lamblia, nontyphoidal Salmonella, Taenia solium, Vibrio cholerae O1, and Yersinia enterocolitica.
Another water-borne protozoan infection derived from drinking improperly sanitized water is giardiasis, an inflammation of the intestines caused by the organism Giardia lamblia.
The Giardia lamblia cyst--common wherever there are beavers -- that has caused numerous water-related illnesses, is classified as a protozoan.
describe a gene in the diplomonad Giardia lamblia that appears to be related to a gene for another mitochondrial protein.
We tested for Giardia lamblia by using an ELISA kit (RIDASCREEN Giardia; R-Biopharm, Darmstadt, Germany), and rotavirus was detected with an enzyme immunoassay kit (RIDA Quick Rotavirus; R-Biopharm).
Simultaneous detection of Entamoeba histolytica, Giardia lamblia, and Cryptosporidium parvum in fecal samples by using multiplex real-time PCR.
Giardiasis, an infection caused by Giardia lamblia in the small intestine, is believed to chronically infect up to 20% of the world's population.
Q I am trying to detect Giardia lamblia and Cyclospora cayetanensis from stool samples extracted by Qiagen stool mini-kit, and used the Weiss and Relman PCR protocols, respectively.