Intestinal Nematodes

Question 1

Enterobius vermicularis

Answer 1

Pinworm, embryonated egg with slanted roof top, intestinal nematode

Question 2

Trichuris trichiura

Answer 2

Whip worm, unembryonated egg with bipolar plugs, intestinal nematode

Question 3

Ascaris lumbricoidies

Answer 3

Large intestinal roundworm, (un)embryonated with or without albumin covering around egg shell

Question 4

Necator americanus

Answer 4

New world hookworm, eggs (embryo cleavages) with thin egg shell; adult by cal cavity has cutting plates

Question 5

Ancylostoma duodenales

Answer 5

Old world hookworm, eggs identical to New world hookworm; adult buccal cavity has 4 teeth

Question 6

Strongyloidies sterocoralis

Answer 6

Threadworm, rhabditoform larvae with short buccal cavity, hour glass esophagus, genital primordium

Question 7

Trichinella spiralis

Answer 7

Pork/trichina worm, encysted larvae (nurse cell) in striated/teased muscle tissue

Question 8

Toxocara canis

Answer 8

Dog/cat large intestinal roundworm, larvae in tissue or egg in feces with rope/lariat like capsule around egg

Question 9

Dracunculus medinensus

Answer 9

Guinea worm, adult emerges from skin

Question 10

Dirofilaria immitis

Answer 10

Dog/cat heart worm, filariform larvae in blood

Question 11

Baylisascaris procyonis

Answer 11

Raccoon roundworm, thick walled egg in feces

Question 12

Anisakis simplex

Answer 12

Fish/sea lion roundworm, egg with four compartments