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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...
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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...
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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...
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...
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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American Trypanosomiasis

Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...

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Related Experiment Video

Updated: Jul 19, 2026

Comparative Analysis of Automatic Fecal Analyzer versus Direct Wet Smear Microscopy for Detecting Parasitic Infections in Stool Samples
04:57

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

Published on: April 25, 2025

Parasitic gut infections.

J F Rossignol1

  • 1The Romark Institute for Medical Research, Tampa, FL 33607, USA.

Current Opinion in Infectious Diseases
|October 13, 2006
PubMed
Summary

New diagnostic methods improve the detection of emerging intestinal parasites like cryptosporidia and microsporidia. Enzyme immunoassays and PCR offer greater sensitivity and species differentiation for public health challenges.

Area of Science:

  • Medical Parasitology
  • Infectious Diseases
  • Public Health

Background:

  • Spore-forming protozoa, including cryptosporidia and microsporidia, represent growing public health concerns globally.
  • Diagnosing these emerging intestinal parasites is challenging compared to traditional protozoa and helminths.
  • These organisms are increasingly recognized as significant causes of gastrointestinal illness.

Purpose of the Study:

  • To highlight the diagnostic challenges posed by emerging spore-forming protozoa.
  • To introduce advanced diagnostic techniques for detecting and differentiating intestinal parasites.
  • To emphasize the public health importance of accurate parasitic diagnosis.

Main Methods:

  • Enzyme immunoassay (EIA) techniques for parasite detection.

Related Experiment Videos

Last Updated: Jul 19, 2026

Comparative Analysis of Automatic Fecal Analyzer versus Direct Wet Smear Microscopy for Detecting Parasitic Infections in Stool Samples
04:57

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

Published on: April 25, 2025

  • Polymerase chain reaction (PCR) for enhanced sensitivity and specificity.
  • Application of these methods for Cryptosporidium parvum, microsporidia, Entamoeba histolytica, and Giardia lamblia.
  • Main Results:

    • EIA and PCR significantly increase the sensitivity of parasite detection.
    • These molecular and immunological assays enable accurate species identification.
    • First-time species differentiation is achieved for Entamoeba histolytica/dispar and Encephalitozoon intestinalis/Enterocytozoon bieneusi.

    Conclusions:

    • Advanced diagnostic tools like EIA and PCR are crucial for managing emerging parasitic infections.
    • Improved diagnostic capabilities facilitate better public health surveillance and control strategies.
    • Accurate species identification aids in understanding disease transmission and implementing targeted treatments.