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Related Concept Videos

Giardiasis01:12

Giardiasis

Giardiasis is a globally prevalent intestinal infection caused by the protozoan parasite Giardia duodenalis (also known as G. lamblia or G. intestinalis). This flagellated protozoan is the most frequently identified intestinal parasite in the United States and worldwide. Transmission primarily occurs via the fecal-oral route, with infection arising from ingestion of water or food contaminated with cysts. Individuals in low-resource settings, international travelers, outdoor enthusiasts, daycare...
Amebiasis01:28

Amebiasis

Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...
Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
Fungal Phylum Microsporidia01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...

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Related Experiment Video

Updated: Jul 16, 2026

Comparative Analysis of Automatic Fecal Analyzer versus Direct Wet Smear Microscopy for Detecting Parasitic Infections in Stool Samples
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Comparative Analysis of Automatic Fecal Analyzer versus Direct Wet Smear Microscopy for Detecting Parasitic Infections in Stool Samples

Published on: April 25, 2025

[Parasitic diarrhea].

Patrice Bourée1, Francine Bisaro

  • 1Unité des Maladies Parasitaires et Tropicales, Hôpital Bicêtre, Le Kremlin-Bicêtre. patrice.bouree@bct.aphp.fr

Presse Medicale (Paris, France : 1983)
|March 6, 2007
PubMed
Summary

Diarrhea after tropical travel is often caused by parasites like Entamoeba histolytica. Diagnosis and treatment are effective, but preventing parasitic infections remains challenging.

Area of Science:

  • Medical Parasitology
  • Infectious Diseases
  • Gastroenterology

Context:

  • Diarrhea is a common ailment following travel to tropical regions.
  • Parasitic infections are a primary cause of both acute and chronic diarrhea.
  • Intestinal parasites, including helminths and protozoa, affect individuals globally.

Purpose:

  • To review the common causes of diarrhea related to intestinal parasites.
  • To highlight diagnostic methods and treatment strategies for parasitic diarrhea.
  • To discuss the challenges in prophylaxis of parasitic infections.

Summary:

  • Amebiasis is the leading cause of acute diarrhea, particularly after tropical travel.
  • Chronic diarrhea is often associated with other intestinal parasites such as Giardia, Cryptosporidium, and Microsporidium, especially in immunocompromised individuals.

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Last Updated: Jul 16, 2026

Comparative Analysis of Automatic Fecal Analyzer versus Direct Wet Smear Microscopy for Detecting Parasitic Infections in Stool Samples
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Experimental Infection of Mice with the Parasitic Nematode Strongyloides ratti
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  • Helminthic infections, both common and tropical, can manifest as diarrhea with blood and hypereosinophilia.

    • Impact:

    • Effective and well-tolerated treatments are available for most parasitic diarrheal diseases.
    • Accurate stool examination is crucial for diagnosing parasitic infections.
    • Public health initiatives face challenges in educating populations on effective prophylaxis against parasitic diseases.