Important Questions and Answers in Parasitology

Parasitology Important Topics 

• Parasitology : Classification of Amoeba
• Parasitology : Flagellates
  • Giardia Lamblia
  • Lab Diagnosis
  • Trichomonas Vaginalis
• Parasitology : Hemoflagellates
  • Trypanosoma Cruzi / South American Trypanosomiasis
  • Leishmania Donovani
  • Kala Azar
  • Cutaneous Leishmaniasis
• Parasitology : Coccidian Parasites
  • Toxoplasma Gondii
  • Cryptosporidium’
  • Cylospora and Isospora
  • Difference between Cryptosporidium, Cyclospora and Isospora
• Haematozoa (Plasmodium and Babesia)
  • Malaria
  • Malaria Species
  • Life Cycle
  • Incubation period
  • Babesia
• Cestodes
  • Cestodes
  • Tenia saginata and Tenia Solium
  • Cysticercosis
  • Echinococcus granulosus / Dog Tapeworm
  • Hydatid cyst
  • Echinococcus Multilocularis
  • Hymenolepis Nana / Dwarf tapeworm
  • Egg of H. nana
• Trematodes
  • Schistosomiasis/ Bilharziasis
  • Paragonimus Westermani (Lung Fluke)
  • Clonorchis Sinensis
  • Fasciola Hepatica (Sheep liverfluke)
• Nematodes
  • Roundworm/Ascaris Lumbricoides 
  • Trichuris Trichiura/Whipworm
  • Eggs
  • EnterobiusVermicularis/Pinworm/Threadworm
  • Cutaneous Larva Migrans
  • Strongyloides Stercoralis
  • Filarial Nematodes
  • Clinical Features
  • Loa Loa

Important Questions with Answers 

Q. Organisms with Small Infectivity Dose? 

Ans. Mnemonic: CHHOTA SMALL

• C - Cryptosporidium
• H - E. Histolytica
• H - Enterohemorrhagic E. coli
• S - Shigella
• LLAM - Giardia lamblia

Q. Why a Flask Shaped Ulcer?

Ans. Damages the mucosa and submucosa. Cannot damage the muscularis as it is difficult to break. Thus, it starts breaking submucosa on the sides. Resulting in flask shaped ulcer

Q. Eosinophil Elevation (Charcot Leyden crystal) seen in:

Ans. 

• Allergy
• Parasitic infections

Q. Identify?

Ans: 

• Entamoeba Histolytica trophozoite
• Has pointed pseudopodia
• 1 nucleus
• Central karyosome
• Cartwheel nucleus
• Erythrophagocytosis

Q. Identify?

Ans: 

Entamoeba Histolytica cyst

• 1 to 4 nucleus – Quadrinucleate
• Thick Chromatoid body/ bar

Q. Identify?

Ans: Entamoeba Coli cyst (non pathogenic), 1 to 8 nucleus – Octanucleate

Q. Diagnostic test for amoebic hepatitis?

1. Cysts in sterile pus
2. Trophozoites in the pus
3. Cyst in the intestine
4.  Trophozoites in the feces

Ans: Trophozoites in the pus

Q. Number of nuclei in mature cyst of entamoeba coli?

1. 1
2. 2
3. 4
4. 8

Ans. 8

Q. What is the composition of amoebic chromatoidal bars?

1. Ribonucleoprotein
2. Glycogen
3. Glycoprotein
4. Lipoprotein

Ans. Ribonucleoprotein

Q. The single characteristic feature that is most diagnostic in differentiating entamoeba histolytica from the other intestinal amoebae is the?

1. Size of the cyst
2. Structure of the nucleus
3. Presence of chromatoid bodies
4. Number of nuclei

Ans. Structure of the nucleus

Q. A patient with contact lenses developed corneal ulcers and symptoms of conjunctivitis. Saline Mount preparation of corneal scraping shows double walled cyst with irregular outer wall and smooth inner wall. Probable diagnosis?

1. Acanthamoeba
2. Naegleria
3. Entamoeba
4. Giardia

Ans. Acanthamoeba

Q. A 15 year old girl residing in a village recently returned from a vacation visiting her friends in another village. She complained of severe headache and fever and was diagnosed as a case of pyogenic meningitis and admitted to the hospital. She died 5 days later. Which of the following organisms should be considered in the diagnosis?

1. Entamoeba histolytica
2. Naegleria fowleri
3. Toxoplasma gondii
4. Falciparum malaria

Ans. Naegleria fowleri

Q. All are true about B.coli except?

1. It is a protozoa.
2. Cyst is the infective stage.
3. Usually invades the liver.
4. It is the largest protozoan parasite inhabiting the large intestine in a man.

Ans. Usually invades liver

Q. There is no change in the number of nuclei of cyst and of trophozoite of?

1. Balantidium coli
2. Entamoeba coli
3. Entamoeba histolytica
4. Giardia lamblia

Ans. Balantidium coli

Q. Giardia lamblia attach to the duodenum by :

Ans. Suckling disc/sucking disc, Lectin antigen

Q. Which of the following statements is true about Trichomonas?

1. It has 5 flagella at the posterior end
2. Cysts form is infective
3. Has a suckling disc for attachment
4. Survives well in hot and cold water

Ans. Survives well in hot and cold water

Q. Trypanosoma cruzi initially penetrated through the mucosa and then multiplied in a lesion Chagoma. In the chronic stage of this disease, where are the main lesions often observed?

1. GIT and Respiratory
2. Heart and GIT
3. Heart and liver
4. Spleen and pancreas
5. Ans. Heart and GIT

Q. Romana sign is seen in:

1. Chagas disease
2. Sleeping sickness
3. Kala azar
4. Fasciola

Ans. Chagas disease

Q. In Chagas disease which stage is found in the muscle tissue?

1. Amastigote
2. Promastigote
3. Epimastigote
4. Trypanomastigote

Ans. Amastigote

Q. Tsetse fly is a vector for:

1. Japanese encephalitis
2. Chagas disease
3. Dengue fever
4. Sleeping sickness

Ans. Sleeping sickness

Q. Winterbottom sign is seen in:

1. Toxocariasis
2. Leishmaniasis
3. African trypanosomiasis
4. Toxoplasmosis

Ans. African trypanosomiasis

Q. HIV positive person presented with diarrhoea. Stool examination revealed round acid fast cyst with 8- 12 microns diameter, diagnosis is?

1. E coli
2. E Histolytica
3. Cryptosporidium
4. Cyclospora

Ans. Cyclospora

Q. Parasitophorous vacuole is suggestive of?

1. Cryptosporidium
2. Isospora
3. Cyclospora
4. Giardia

Ans. Cryptosporidium

Q. A person who has recently consumed a box of raspberries came down with severe watery diarrhea. What is the most likely diagnosis?

1. Cyclospora
2. Cryptosporidium
3. Isospora
4. Vibrio

Ans. Cyclospora

Q. Sabin Feldman test is used for?

1. Leishmania
2. Malaria
3. Toxoplasma
4. Trypanosoma

Ans. Toxoplasma

Q. Which of the following is not a coccidean?

1. Cyclospora
2. Isospora
3. Cryptosporidium
4. Entamoeba coli

Ans. Entamoeba coli

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