Detection of Intestinal Parasites

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March 2009

Therefore, we have included a third category in our algorithm to cover patients that may have recently traveled to an endemic country, or have been in parts of the United States where helminth infections are still reported. The ova and parasite examination, referred to as the parasite examination in feces, is an excellent test for detection of helminth eggs and should be considered in this small subset of patients.

We also have a category of exclusion for Microsporidia and testing in patients who are negative for other intestinal parasites.

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• Introduction
• Intestinal Parasites
• Detection of Intestinal Parasites
• Direct Smear of Fresh Feces
• Direct Smear of Fresh Feces
• Motile Trophozoite of Pentatrichomonas hominis
• Motile Larva of Strongyloides stercoralis
• Feces Concentration
• Concentrated Feces with Saline
• Concentrated Feces Wet Preparation
• Concentrated Fecal Smear Stained with a Modified Trichrome Stain
• Giardia intestinalis
• Additional Tests on Fecal Samples
• Which One to Order?
• Parasitic Investiagation of Stool Specimens Algorithm
• Giardia intestinalis
• Life Cycle of Giardia
• Concentrated Feces Wet Preparation
• Giardia intestinalis - Cyst
• Giardia intestinalis - Trophozoite
• Clinical Presentation
• Epidemiology
• US Risk Factors for Giardiasis
• G intestinalis is Easily Transmitted Because
• Diagnosis of Giardiasis
• Algorithm Close-up
• Giardia Antigen Test, Feces
• Sandwich Assay
• ELISA Microtiter Plate
• Treatment
• Cryptosporidium spp
• Cryptosporidium Life Cycle
• Cryptosporidium - Cyst on Wet Prep
• Cryptosporidium - Cysts with Acid Fast Stain
• Clinical Presentation
• Epidemiology
• Examples of Outbreaks
• Examples of Outbreaks
• Cryptosporidium is Easily Acquired Because
• Diagnosis
• Algorithm Close-up
• Cryptosporidium Antigen Test, Feces
• Treatment
• Less Common Fecal Parasites
• Algorithm Close-up
• References
• Questions?