Intestinal nematodes (Part 1) Flashcards

1
Q

List the common name for the Ascaris.

A

None

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2
Q

Diagnostic form of Ascaris.

A

Eggs/ eggs ingested from oil, food, water

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3
Q

Describe the microscopically appearance of Ascaris.

A
  • Oval eggs, often stain brown in stool
  • Infertile eggs are elongated, bizarre shaped (no male present)
  • Mammilated coat (decorticated= lost coat)
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4
Q

List the common name for the Ancylostoma duodenale.

A

Hookworm. (old world)

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5
Q

List the common name for the Necator americanus.

A

Hookworm. (new World)

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6
Q

Diagnostic form of Hookworm and describe the microscopically appearance.

A

Eggs in stool- oval, colorless, thin-shelled
Filariform larvae- pointed tail
Rhabditiform larvae- bulb in some area and longer buccal cavity.
Adult

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7
Q

Differentiate Ancylostoma and Necator in diganosis of hookworm adults.

A

Ancylostoma has two pairs cutting teeth

Necator has cutting plates

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8
Q

List the common name for the Strongyloides stercoralis

A

Threadworm

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9
Q

Diagnostic form of Strongyloides stercoralis.

A

Rhabditiform Larvae; eggs rarely seen in stool (if eggs are ever seen that resembles hookworm)

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10
Q

Microscopic appearance of Larvae see in Stronglyoides stercoralis.

A

Rhabditiform larvae seen in stool- short buccal cavity and large genital primordium (“short & sexy)
Filariform larvae-notched tail

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11
Q

List the common name for Enterobius vermicularis.

A

Pinworm (sharply pointed tail of female)

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12
Q

Diagnostic form of Enterobius vermicularis.

A

No fecal specimen (eggs not usually seen in feces).
cellophane tape preparation or paddle.
Lay eggs outside anus at night

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13
Q

Describe the microscopic appearance of Enterobius vermicularis: Adult female and Eggs.

A

Adult female= pointed tail (male tail is curved, alae (3 lips)
Eggs oval, slightly flattened, with thin, smooth, colorless shell. Usually internal larvae can be see.

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14
Q

List the common name for Trichuris trichiura.

A

Whipworm

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15
Q

The diagnostic form of Trichuris trichiura.

A

Eggs passed in stool (occasionally adult)

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16
Q

Microscopic appearance of eggs in Trichuris trichiura.

A

Barrel-shaped eggs, with polar plugs at each end, unembryonated.

17
Q

List the common name for nematodes.

A

Roundworms.