Micro - Parasitology Flashcards Preview

USMLE (S1) Microbiology > Micro - Parasitology > Flashcards

Flashcards in Micro - Parasitology Deck (24)
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1
Q

A man bitten by a tsetse fly has lymphadenopathy, fever, somnolence, and coma. Blood smear is shown here. What is the diagnosis?

A

African sleeping sickness

2
Q

What are the two laboratory diagnostic tests for amebiasis?

A

Serologic studies and stool examination for trophozoites or cysts; red blood cells in the cytoplasm of entamoeba

3
Q

An AIDS patient presents with severe diarrhea. A stool sample shows cysts on acid-fast stain. Diagnosis?

A

Cryptosporidium

4
Q

A camper with diarrhea presents with foul-smelling diarrhea. You see trophozoites and cysts in the stool. Diagnosis and treatment?

A

Giardia lamblia; treatment is metronidazole

5
Q

A patient has hemolytic anemia and fever after a tick bite. On blood smear there are “Maltese cross” forms. What is the diagnosis?

A

Babesiosis

6
Q

How is the diagnosis of malaria made?

A

Blood smear, trophozoite ring form, and red blood cell schizont with merozoites

7
Q

Praziquantel is used to treat diseases caused by which helminths?

A

Most of the cestodes and trematodes: Taenia solium, Diphyllobothrium latum, Schistosoma, Clonorchis sinensis, and Paragonimus westermani

8
Q

Which helminthic infections are treated with mebendazole or pyrantel pamoate?

A

Ancylostoma duodenale (hookworm), Ascaris lumbricoides (giant roundworm), and Enterobius vermicularis (pinworm)

9
Q

Ivermectin is used to treat diseases caused by which helminths?

A

Strongyloides stercoralis and Onchocerca volvulus

10
Q

Diethylcarbamazine is used to treat diseases caused by which helminths?

A

Loa loa, Toxocara canis, and Wuchereria bancrofti

11
Q

Which helminths infect humans via the direct penetration of the skin?

A

Schistosoma, Ancylostoma duodenale (hookworm), and Strongyloides stercoralis

12
Q

Granulomas are formed in infections that are caused by which helminths?

A

Schistosoma and Toxocara canis

13
Q

Chronic infection with Schistosoma haematobium can lead to what cancer?

A

Squamous cell carcinoma of the bladder

14
Q

Which nematodes are transmitted by ingesting contaminated food?

A

Enterobius, Ascaris, and Trichinella (remember: you’ll get sick if you EAT these!)

15
Q

Which nematodes are transmitted cutaneously?

A

Strongyloides, Ancylostoma, and Necator (remember: these get into your feet from SANd)

16
Q

Name the parasite that causes brain cysts and seizures.

A

Taenia solium

17
Q

Name the helminth that causes liver cysts.

A

Echinococcus granulosus

18
Q

Name the helminth that causes vitamin B12 deficiency.

A

Diphyllobothrium latum

19
Q

Name the helminth that causes biliary tract disease and is associated with cholangiosarcoma.

A

Clonorchis sinensis

20
Q

Name the helminth that causes hemoptysis.

A

Paragonimus westermani

21
Q

Name the helminth that causes portal hypertension.

A

Schistosoma mansoni

22
Q

Name the helminth that causes hematuria and bladder cancer.

A

Schistosoma haematobium

23
Q

Name the helminth that cause microcytic anemia.

A

Ancylostoma and Necator

24
Q

Name the helminth that causes perianal pruritus.

A

Enterobius