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DTMH - Parasitology & Entomology Slides > Nematodes (Roundworms) > Flashcards

Nematodes (Roundworms) Flashcards

1
Q

A histological section of liver is shown

  1. Name this parasite (size: 63 um)
  2. State your reasons
  3. Name one intermediate host
  4. Name one definitive host
  5. How do humans become infected with this parasite?
  6. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. No intermediate host and has a direct lifecycle
  4. Foxes, rodents
  5. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  6. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

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2
Q

This specimen was retrieved during a colonoscopy

  1. Name this parasite (size: 41 mm)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichuris trichiura
  2. Characteristic adult with whip-like anterior end and thicker posterior end (straight posterior in females; coiled posterior in males)
    * Within size range (30-50 mm) for T. trichiura adults
  3. Consumption of embryonated eggs via soil-contaminated food or hands
  4. Albendazole
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3
Q
  1. Name this parasite (size: 53 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichuris trichiura
  2. Characteristic barrel-shaped eggs
    * Within size range (50-55 um) for T. trichiura
    * Pair of polar plugs
    * Thick-shelled
    * Unembryonated
  3. Consumption of embryonated eggs via soil-contaminated food or hands
  4. Albendazole
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4
Q
  1. Name this parasite (size: 63 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. Characteristic egg
    * Within size range (60-75 um) for N. americanus/A. duodenale
    * Thin, colourless shell
  3. Filariform larvae penetrate skin
  4. Mebendazole, Albendazole
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5
Q
  1. Name this parasite (size: 78 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichostrongylus sp
  2. Characteristic ovoid/elongated egg
    * Within size range (75-95 um) for Trichostrongylus sp.
    * Thin, colourless shell
  3. Ingestion of filariform larvae
  4. Albendazole, Mebendazole, Pyrantel pamoate
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6
Q

A histological section of the liver is shown

  1. Name this parasite (size: 60 um)
  2. State your reasons
  3. Name one intermediate host
  4. Name one definitive host
  5. How do humans become infected with this parasite?
  6. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. No intermediate host and has a direct lifecycle
  4. Foxes, rodents
  5. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  6. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

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7
Q
  1. Name this parasite (size: 280 um)
  2. What is the lifecycle stage?
  3. State your reasons
  4. How do humans become infected with this parasite?
  5. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. L1 Rhabditiform larva
  3. Characteristic rhabditiform larva
    * Within size range (250-300 um) for hookworm L1 larva
    * Inconspicuous genital primordium (as opposed to prominent with S. stercoralis)
    * Long buccal canal (as opposed to short with S. stercoralis)
  4. Filariform larvae penetrate skin
  5. Mebendazole, Albendazole
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8
Q
  1. Name this parasite (size: 580 um)
  2. What is the lifecycle stage?
  3. State your reasons
  4. How do humans become infected with this parasite?
  5. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. L3 Filariform larva
  3. Characteristic filariform larva
    * Within size range (500-700 um) for hookworm L3 larva
    * Pointed tail (as opposed to notched with S. stercoralis)
    * Esophagus:intestine ratio of 1:2 (as opposed to 1:1 with S. stercoralis)
  4. Filariform larvae penetrate skin
  5. Mebendazole, Albendazole
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9
Q
  1. Name this parasite (size: 86 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic large, elongated infertile egg
    * Within the size range (up to 90 um) for A. lumbricoides infertile eggs
    * Mammillated layer with protuberances
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
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10
Q

A histological section of the liver is shown

  1. Name this parasite (size: 55 um)
  2. State your reasons
  3. Name one intermediate host
  4. Name one definitive host
  5. How do humans become infected with this parasite?
  6. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. No intermediate host and has a direct lifecycle
  4. Foxes, rodents
  5. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  6. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

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11
Q
  1. Name this parasite (size: 72 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. Characteristic egg
    * Within size range (60-75 um) for N. americanus/A. duodenale
    * Thin, colourless shell
  3. Filariform larvae penetrate skin
  4. Mebendazole, Albendazole
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12
Q

A histological section of the liver is shown

  1. Name this parasite (size: 68 um)
  2. State your reasons
  3. Name one intermediate host
  4. Name one definitive host
  5. How do humans become infected with this parasite?
  6. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. No intermediate host and has a direct lifecycle
  4. Foxes, rodents
  5. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  6. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

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13
Q
  1. Name this parasite (size: 540 um)
  2. What is the lifecycle stage?
  3. State your reasons
  4. How do humans become infected with this parasite?
  5. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. L3 Filariform larva
  3. Characteristic filariform larva
    * Within size range (500-700 um) for hookworm L3 larva
    * Pointed tail (as opposed to notched with S. stercoralis)
    * Esophagus:intestine ratio of 1:2 (as opposed to 1:1 with S. stercoralis)
  4. Filariform larvae penetrate skin
  5. Mebendazole, Albendazole
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14
Q
  1. Name this parasite (size: 55 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Enterobius vermicularis
  2. Characteristic transparent, elongated egg
    * Within the size range (50-60 um) for E. vermicularis
    * One side flattened
    * Partially embryonated
  3. Consumption of eggs that are immediately infective
  4. Mebendazole, Albendazole
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15
Q
  1. Name this parasite (size: 78 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic large, elongated decorticated infertile egg
    * Within the size range (up to 90 um) for A. lumbricoides infertile eggs
    * Lacking a mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
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16
Q
  1. Name this parasite (size: 80 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic large, elongated decorticated infertile egg
    * Within the size range (up to 90 um) for A. lumbricoides infertile eggs
    * Lacking a mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
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17
Q
  1. Name this parasite (size: 65 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  4. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

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18
Q
  1. Name this parasite (size: 53 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Enterobius vermicularis
  2. Characteristic transparent, elongated egg
    * Within the size range (50-60 um) for E. vermicularis
    * One side flattened
    * Partially embryonated
  3. Consumption of eggs that are immediately infective
  4. Mebendazole, Albendazole
19
Q
  1. Name this parasite (size: 30 cm)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic Ascaris adult worm
    * Within the size range (20-35 cm) for A. lumbricoides female worms
    * Rounded, non-segmented
    * Had 3 lips appearance of Ascarid worms
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
20
Q
  1. Name this parasite (size: 83 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic large, elongated infertile egg
    * Within the size range (up to 90 um) for A. lumbricoides infertile eggs
    * Mammillated layer with protuberances
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
21
Q
  1. Name this parasite (size: 61 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic rounded fertile egg
    * Within the size range (45-75 um) for A. lumbricoides fertile eggs
    * Thick shell with an external mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
22
Q
  1. Name this parasite (size: 53 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  4. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

23
Q
  1. Name this parasite (size: 49 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic rounded, decorticated fertile egg
    * Within the size range (45-75 um) for A. lumbricoides fertile eggs
    * Lack of an external mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
24
Q
  1. Name this parasite (size: 59 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Enterobius vermicularis
  2. Characteristic transparent, elongated egg
    * Within the size range (50-60 um) for E. vermicularis
    * One side flattened
    * Partially embryonated
  3. Consumption of eggs that are immediately infective
  4. Mebendazole, Albendazole
25
Q
  1. Name this parasite (size: 69 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. Characteristic egg
    * Within size range (60-75 um) for N. americanus/A. duodenale
    * Thin, colourless shell
  3. Filariform larvae penetrate skin
  4. Mebendazole, Albendazole
26
Q
  1. Name this parasite (size: 56 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic rounded fertile egg
    * Within the size range (45-75 um) for A. lumbricoides fertile eggs
    * Thick shell with an external mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
27
Q

This specimen was recovered from a colonoscopy

  1. Name this parasite (size: 12 mm)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Enterobius vermicularis
  2. Characteristic adult worm
    * Within the size range (8-13 mm) for E. vermicularis female adults
    * Long pointed tail
    * Cephalic Expansion
  3. Consumption of eggs that are immediately infective
  4. Mebendazole, Albendazole
28
Q
  1. Name this parasite (egg size: 39 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria philippinensis
  2. Characteristic egg
    * Within size range (35-45 um) of C. philippinensis
    * Polar plugs
    * Striated shell
  3. Ingestion of raw/undercooked fish with infective larvae or auto-infective cycle
  4. Mebendazole, Albendazole
29
Q
  1. Name this parasite (size: 67 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. Characteristic egg
    * Within size range (60-75 um) for N. americanus/A. duodenale
    * Thin, colourless shell
  3. Filariform larvae penetrate skin
  4. Mebendazole, Albendazole
30
Q

A histological section of a colon is shown

  1. Name this parasite (size: 57 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Enterobius vermicularis
  2. Characteristic transparent, elongated egg
    * Within the size range (50-60 um) for E. vermicularis
    * One side flattened
    * Partially embryonated
  3. Consumption of eggs that are immediately infective
  4. Mebendazole, Albendazole
31
Q
  1. Name this parasite (size: 93 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichostrongylus sp
  2. Characteristic ovoid/elongated egg
    * Within size range (75-95 um) for Trichostrongylus sp.
    * Thin, colourless shell
  3. Ingestion of filariform larvae
  4. Albendazole, Mebendazole, Pyrantel pamoate
32
Q

A histological section of the liver is shown

  1. Name this parasite (size: 59 um)
  2. State your reasons
  3. Name one intermediate host
  4. Name one definitive host
  5. How do humans become infected with this parasite?
  6. Name one drug used to treat infection with this parasite
A
  1. Capillaria hepatica
  2. Characteristic ellipsoid egg
    * Within size range (50-70 um) of C. hepatica
    * Polar plugs
    * Striated shell
  3. No intermediate host and has a direct lifecycle
  4. Foxes, rodents
  5. Ingesting embryonated eggs in fecally-contaminated food, water, or soil
  6. Mebendazole, Albendazole

N.b. Finding of C. hepatica eggs in human stool indicates spurious passage and likely consumption of infected meat/liver

33
Q
  1. Name this parasite (size: 41 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria philippinensis
  2. Characteristic egg
    * Within size range (35-45 um) of C. philippinensis
    * Polar plugs
    * Striated shell
  3. Ingestion of raw/undercooked fish with infective larvae or auto-infective cycle
  4. Mebendazole, Albendazole
34
Q
  1. Name this parasite (size: 74 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. Characteristic egg
    * Within size range (60-75 um) for N. americanus/A. duodenale
    * Thin, colourless shell
  3. Filariform larvae penetrate skin
  4. Mebendazole, Albendazole
35
Q

A histological section of an appendix is shown

  1. Name this parasite (size: 60 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic rounded, decorticated fertile egg
    * Within the size range (45-75 um) for A. lumbricoides fertile eggs
    * Thick shell with an external mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
36
Q
  1. Name this parasite (size: 71 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Ascaris lumbricoides
  2. Characteristic rounded fertile egg
    * Within the size range (45-75 um) for A. lumbricoides fertile eggs
    * Thick shell with an external mammillated layer
  3. Swallowing infective eggs
  4. Mebendazole, Albendazole
37
Q
  1. Name this parasite (size: 41 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria philippinensis
  2. Characteristic egg
    * Within size range (35-45 um) of C. philippinensis
    * Polar plugs
    * Striated shell
  3. Ingestion of raw/undercooked fish with infective larvae or auto-infective cycle
  4. Mebendazole, Albendazole
38
Q
  1. Name this parasite (size: 293 um)
  2. What is the lifecycle stage?
  3. State your reasons
  4. How do humans become infected with this parasite?
  5. Name one drug used to treat infection with this parasite
A
  1. Necator americanus/Ancylostoma duodenale
  2. L1 Rhabditiform larva
  3. Characteristic rhabditiform larva
    * Within size range (250-300 um) for hookworm L1 larva
    * Inconspicuous genital primordium (as opposed to prominent with S. stercoralis)
    * Long buccal canal (as opposed to short with S. stercoralis)
  4. Filariform larvae penetrate skin
  5. Mebendazole, Albendazole
39
Q
  1. Name this parasite (size: 53 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichuris trichiura
  2. Characteristic barrel-shaped eggs
    * Within size range (50-55 um) for T. trichiura
    * Pair of polar plugs
    * Thick-shelled
    * Unembryonated
  3. Consumption of embryonated eggs via soil-contaminated food or hands
  4. Albendazole

N.b. this is an atypical T. trichiura egg

40
Q
  1. Name this parasite (size: 88 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichostrongylus sp
  2. Characteristic ovoid/elongated egg
    * Within size range (75-95 um) for Trichostrongylus sp.
    * Thin, colourless shell
  3. Ingestion of filariform larvae
  4. Albendazole, Mebendazole, Pyrantel pamoate
41
Q
  1. Name this parasite (size: 53 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichuris trichiura
  2. Characteristic barrel-shaped eggs
    * Within size range (50-55 um) for T. trichiura
    * Pair of polar plugs
    * Thick-shelled
    * Unembryonated
  3. Consumption of embryonated eggs via soil-contaminated food or hands
  4. Albendazole
42
Q
  1. Name this parasite (size: 84 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Trichostrongylus sp
  2. Characteristic ovoid/elongated egg
    * Within size range (75-95 um) for Trichostrongylus sp.
    * Thin, colourless shell
  3. Ingestion of filariform larvae
  4. Albendazole, Mebendazole, Pyrantel pamoate
43
Q
  1. Name this parasite (size: 37 um)
  2. State your reasons
  3. How do humans become infected with this parasite?
  4. Name one drug used to treat infection with this parasite
A
  1. Capillaria philippinensis
  2. Characteristic egg
    * Within size range (35-45 um) of C. philippinensis
    * Polar plugs
    * Striated shell
  3. Ingestion of raw/undercooked fish with infective larvae or auto-infective cycle
  4. Mebendazole, Albendazole

DTMH - Parasitology & Entomology Slides (20 decks)

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