20 Questions
What is the characteristic feature of the chromatoidal bar in Entamoeba histolytica cyst?
It has a smooth end
Which of the following intestinal helminths is NOT measured in micrometers (µm)?
Clonorchis
What is the purpose of faecal microscopic examination in the diagnosis of intestinal parasites?
To identify the type of parasitic infection
Which of the following parasites is a protozoan?
Entamoeba histolytica
What is the characteristic feature of Entamoeba histolytica cyst in terms of the number of nuclei?
It has two nuclei
Which of the following intestinal helminths is classified as a cestode?
Taenia spp.
What is the size of the Enterobius sinensis?
40 µm x 30 µm
Which of the following parasites has a size of 70 µm x 40 µm?
Hookworm
What is the primary method for diagnosing parasitic infections in humans?
Microscopic analysis of faecal, blood, tissue or sputum samples
What is the size of the Schistosoma japonicum?
85 µm x 60 µm
Which of the following parasites is characterized by the presence of a red cell in its cytoplasm?
Entamoeba histolytica
Which of the following parasites has a variable size?
Ascaris lumbricoides
What is the primary reason for understanding parasite life cycles and routes of transmission?
To accurately diagnose and prevent parasitic infections
What is the size of the Paragonimus westermani?
110 µm x 60 µm
What is the term for the study of the distribution and determinants of parasitic infections?
Epidemiology
Which of the following parasites has a size of 140 µm x 75 µm?
Fasciola hepatica
Which of the following statements is true about parasitic infections?
There are no vaccines registered for use against any human parasite
What is the size of the Ascaris lumbricoides?
60 µm x 35 µm
What is the term for the study of the morphology of protozoa and helminths?
Parasitological morphology
Which of the following parasites has a size of 160 µm x 60 µm?
Schistosoma mansoni
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.
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.
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