Microscopic Diagnosis of Intestinal Parasites

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Questions and Answers

What is the characteristic feature of the chromatoidal bar in Entamoeba histolytica cyst?

It has a rough end

It has a smooth end (correct)

It is a characteristic of mature cysts only

It is absent in immature cysts

Which of the following intestinal helminths is NOT measured in micrometers (µm)?

Clonorchis (correct)

Trichuris trichiura

Hymenolepis nana

Ascaris

What is the purpose of faecal microscopic examination in the diagnosis of intestinal parasites?

To identify the type of parasitic infection (correct)

To assess the nutritional status of the individual

To examine the gut motility

To detect the presence of bacteria

Which of the following parasites is a protozoan?

Entamoeba histolytica Signup and view all the answers

What is the characteristic feature of Entamoeba histolytica cyst in terms of the number of nuclei?

It has two nuclei Signup and view all the answers

Which of the following intestinal helminths is classified as a cestode?

Taenia spp. Signup and view all the answers

What is the size of the Enterobius sinensis?

40 µm x 30 µm Signup and view all the answers

Which of the following parasites has a size of 70 µm x 40 µm?

Hookworm Signup and view all the answers

What is the primary method for diagnosing parasitic infections in humans?

Microscopic analysis of faecal, blood, tissue or sputum samples Signup and view all the answers

What is the size of the Schistosoma japonicum?

85 µm x 60 µm Signup and view all the answers

Which of the following parasites is characterized by the presence of a red cell in its cytoplasm?

Entamoeba histolytica Signup and view all the answers

Which of the following parasites has a variable size?

Ascaris lumbricoides Signup and view all the answers

What is the primary reason for understanding parasite life cycles and routes of transmission?

To accurately diagnose and prevent parasitic infections Signup and view all the answers

What is the size of the Paragonimus westermani?

110 µm x 60 µm Signup and view all the answers

What is the term for the study of the distribution and determinants of parasitic infections?

Epidemiology Signup and view all the answers

Which of the following parasites has a size of 140 µm x 75 µm?

Fasciola hepatica Signup and view all the answers

Which of the following statements is true about parasitic infections?

There are no vaccines registered for use against any human parasite Signup and view all the answers

What is the size of the Ascaris lumbricoides?

60 µm x 35 µm Signup and view all the answers

What is the term for the study of the morphology of protozoa and helminths?

Parasitological morphology Signup and view all the answers

Which of the following parasites has a size of 160 µm x 60 µm?

Schistosoma mansoni Signup and view all the answers

Study Notes

Parasitic Infections

There are no vaccines registered for use against any human parasite.
Understanding parasite life cycles and routes of transmission (epidemiology) is key to accurate diagnosis, prevention, and control of parasitic infections.

Faecal Microscopic Diagnosis of Intestinal Helminths

Hymenolepis nana: 40 µm x 30 µm
Trichuris trichiura: 45 µm x 30 µm
Ascaris lumbricoides: 50 µm x 20 µm
Diphyllobothrium latum: 70 µm x 40 µm
Clonorchis sinensis: 30 µm x 16 µm
Enterobius: 55 µm x 25 µm (fertilized) and 60 µm x 35 µm (unfertilized)
Hookworm: 70 µm x 30 µm
Taenia spp.: size variable

Faecal Microscopic Diagnosis of Intestinal Protozoa

Entamoeba histolytica trophozoite: 5 µm (acid-fast stain), has a red cell in cytoplasm
Entamoeba histolytica cyst: 15 µm, has two nuclei, smooth-ended chromatoidal bar

Parasite Identification

Schistosoma japonicum: 85 µm x 60 µm
Paragonimus westermani: 110 µm x 60 µm
Fasciolopsis buski: 135 µm x 80 µm
Fasciola hepatica: 140 µm x 75 µm
Schistosoma mansoni: 160 µm x 60 µm
Schistosoma haematobium: 170 µm x 60 µm

Diagnosis

Diagnosis is achieved through microscopic analyses of faecal, blood, tissue or sputum samples or PCR or antibody tests.

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Description

Identify the characteristics of Entamoeba histolytica cyst under a microscope. Observe the nuclei and chromatoidal bar. This quiz is essential for faecal microscopic diagnosis of intestinal helminths.