Deck 1: Introduction and Nematoda

Question 1

A clinical sign that may suggest the presence of a filarial nematode infection is:

A) Diarrhea
B) Eosinophilia
C) Jaundice
D) Microcytic anemia

Answer 1

Eosinophilia

Question 2

The nematode infection that may become more severe through ingestion of infective eggs, especially in infected infants, is:

A) Ancylostoma duodenale
B) Enterobius vermicularis
C) Strongyloides stercoralis
D) Trichinella spiralis

Answer 2

Enterobius vermicularis

Question 3

In the Ascaris lumbricoides life cycle, after eggs are ingested, the next stage in the life cycle that must occur before a mature adult can live in the host's intestine is called the:

A) Diagnostic stage
B) Infective stage
C) Liver-lung migration
D) Method of infection

Answer 3

Liver-lung migration

Question 4

Patients who have heavy infections with Necator americanus may exhibit all of the following symptoms EXCEPT:

A) Diarrhea
B) Larval dermatitis
C) Macrocytic anemia
D) Microcytic anemia

Question 5

The nematode egg that appears as a barrel-shaped structure with clear polar plugs at each end of the egg belongs to:

A) Ascaris lumbricoides
B) Enterobius vermicularis
C) Strongyloides stercoralis
D) Trichuris trichiura

Question 6

A slender round worm measuring 25 cm was recovered from a toilet following a child's trip to the bathroom. The specimen most likely is:

A) Ascaris lumbricoides
B) Enterobius vermicularis
C) Strongyloides stercoralis
D) Trichuris trichiura

Question 7

A 7-year-old boy's CBC revealed a microcytic anemia with eosinophilia during an office visit for symptoms of diarrhea. The most likely parasite involved in the infection is:

A) Enterobius vermicularis
B) Necator americanus
C) Trichuris trichiura
D) Wuchereria bancrofti

Question 8

Which of the following infections is not diagnosed by finding eggs or lava in fecal specimens?

A) Ascaris lumbricoides
B) Necator spp.
C) Trichinella spiralis
D) Trichuris trichiura

Question 9

Which of the following parasitic diseases is a zoonosis?

A) Ascaris lumbricoides
B) Dracunculus medinensis
C) Strongyloides stercoralis
D) Trichinella spiralis

Question 10

Cutaneous larvamigrans is caused by:

A) Ascaris lumbricoides
B) Necator americanus
C) Strongyloides stercoralis
D) Toxocara canis

Question 11

The nematode parasite that may complete its life cycle without leaving the host is:

A) Ascaris lumbricoides
B) Necator americanus
C) Strongyloides stercoralis
D) Toxocara canis

Question 12

All of the following have life cycles that require larval lung migrations EXCEPT:

A) Ascaris lumbricoides
B) Necator americanus
C) Strongyloides stercoralis
D) Trichuris trichiura

Question 13

The diagnostic form recovered in feces in Strongyloides stercoralis infections is the:

A) Adult worm
B) Egg
C) Filariform larva
D) Rhabditiform larva

Question 14

A soldier returning from Iraq noticed a blister above his ankle that subsequently opened while he was swimming in his family pool. On further examination, he noticed a worm in the open blister. The possible parasite in this lesion is:

A) Ancylostoma duodenale
B) Dracunculus medinensis
C) Toxocara canis
D) Visceral larva migrans

Question 15

All of the following infections are diagnosed by finding microfilaria in blood EXCEPT:

A) Wuchereria bancrofti
B) Onchocerca volvulus
C) Loa loa
D) Brugia malayi

Question 16

A microfilaria recovered in a blood sample from a patient from Vietnam had two nuclei at the tip of the tail. The worm was enclosed in a sheath. This parasite is:

A) Brugia malayi
B) Loa loa
C) Onchocerca volvulus
D) Wuchereria bancrofti

Question 17

An immigrant from central Africa is exhibiting transient subcutaneous swelling in the arm. A blood smear revealed a sheathed microfilaria with a single row of nuclei present in the posterior of the parasite. The most likely identification is:

A) Brugia malayi
B) Loa loa
C) Onchocerca volvulus
D) Wuchereria bancrofti

Question 18

The diagnosis of Enterobius vermicularis infection is accomplished by observing:

A) Eggs in feces
B) Eggs recovered from the perianal region
C) Larva in feces
D) Trophozoites in feces

Question 19

The rhabditiform larva of Strongyloides stercoralis has a:

A) Long buccal cavity
B) Sheath
C) Large genital primordium
D) Notched tail

Question 20

Closed fecal sanitation systems had directly led to the reduction of all of the following nematode infections EXCEPT:

A) Ascariasis
B) Hookworm disease
C) Strongyloidiasis
D) Trichinosis

Question 21

The diagnostic form of this parasite appears as an oval thin-shelled egg with a clear area around the eight-celled immature embryo. This parasite is:

A) Ascaris lumbricoides
B) Enterobius vermicularis
C) Hookworm
D) Trichuris trichiura

Question 22

The nematode infection that is acquired by ingesting a Cyclops (water flea) is:

A) Dracunculus medinensis
B) Enterobius vermicularis
C) Necator americanus
D) Trichinella spiralis

Question 23

Which of the following organisms or infections could be transmitted in the laboratory?

A) Ascaris lumbricoides-Ascariasis
B) Enterobius vermicularis-pinworm infection
C) Strongyloides stercoralis-Strongyloidiasis
D) Trichuris trichiura-whipworm infection

Question 24

Which of the following parasitic diseases can cause blindness?

A) Brugia malayi
B) Loa loa
C) Onchocerca volvulus
D) Wuchereria bancrofti

Question 25

Elephantiasis is a clinical symptom associated with:

A) Brugia malayi
B) Loa loa
C) Onchocerca volvulus
D) Strongyloides stercoralis

Question 26

Name the parasite shown in the following image:

A) Ascaris lumbricoides egg
B) Enterobius vermicularis egg
C) Hookworm egg
D) Trichuris trichiura egg

Question 27

Name the parasite shown in the following image:

A) Ascaris lumbricoides egg
B) Enterobius vermicularis egg
C) Hookworm egg
D) Trichuris trichiura egg

Question 28

Name the parasite shown in the following image:

A) Ascaris lumbricoides egg
B) Enterobius vermicularis egg
C) Hookworm egg
D) Trichuris trichiura egg

Question 29

Name the parasite shown in the following image:

A) Ascaris lumbricoides egg
B) Enterobius vermicularis egg
C) Hookworm egg
D) Trichuris trichiura egg

Question 30

Name the parasite shown in the following image:

A) Wuchereria bancrofti-microfilaria
B) Filariform larva
C) Pinworm-female
D) Rhabditiform larva

Question 31

In a general nematode parasite's life cycle, the host may ingest a fertile egg. This stage of the life cycle is referred to as the:

A) Definitive host phase
B) Diagnostic stage
C) Infective stage
D) Method of infection

Question 32

A parasite that lives inside a host is referred to as a(n):

A) Accidental parasite
B) Ectoparasite
C) Endoparasite
D) Facultative parasite

Question 33

Zoonosis is a term used to describe humans' relationship with a(n):

A) Accidental parasite
B) Ectoparasite
C) Endoparasite
D) Facultative parasite

Question 34

An animal that harbors a parasite that can also infect humans is referred to as a(n):

A) Definitive host
B) Intermediate host
C) Reservoir host
D) Transport host