Intestinal and Tissue Roundworms Class Nematoda 5.6

  1. This Nematoda is known as the giant intestinal roundworm.
    Ascaris lumbricoides
  2. What are the two hookworms?
    • Necator americanus (new world hookworm)
    • Ancylostoma duodenale (old world hookworm)
  3. This organism is known as the pinworm or seatworm.
    Enterobius vermicularis
  4. This organism is known as the whipworm
    Trichuris trichiura
  5. This is the smallest nematode parasite of man.
    Trichinella spiralis
  6. This Filarial nematode causes Bancroft's disease.
    Wuchereria bancrofti
  7. This filarial nematode is known as the eye-worm.
    Loa loa
  8. This Nematoda species causes River blindness.
    Onchocerca volvulus
  9. This Nematoda species is known as the Guinea fireworm or dragon worm.
    Dracunculus medinensis
  10. This class of organism is free living is water and soil, but parasitic to plants, mollusks, annelids, arthropods, and vertebrates.
  11. Adult worms of this class have a thread-like body, cylindrical in cross section, are unsegmented, have have separate sexes.
  12. Which nematoda are smaller, males or females?
  13. true or false
    Nematoda organisms have a complete digestive tract and nervous system
  14. This Nematoda attaches to tissue via penetration.
  15. This nematoda uses oral method of attachment.
  16. The nematoda organism Ascaris has what method of attachment?
    retention in folds
  17. What is the nematod that attaches via anchorage with attenuated ends?
  18. This nematoda obtains nourishment via sucking blood.
  19. This Nematoda obtains nourishment via ingestion of lysed tissues and blood.
  20. This nematoda obtains nourishment by feeding on intestina contents.
  21. These nematoda obtain nourishment by ingesting food from body fluids.
    filarial worms
  22. Nematoda ova are fertilized in __________. some spp have inner/outer shell. daily output is 20-20000.
  23. Infection of Ascaris lumbricoides is by ingestion of what stage of development.
  24. After ingestion of A. lumbricoides ova, the egg hatches and become __________ larva.
  25. how long does it take Ascaris lumbricoides larva to travel to the liver, heart and lungs?
    1-7 days
  26. Larvae of A. lumbricoides infect the alveolar capillaries, bronchi and are then ____________.
  27. This nematoda infection causes nutritional effects on children. it is the most common helminth infection, worms are passed from anus, nose or mouth.
    Ascaris lumbricoides
  28. The adult forms of this nematoda are white or pink in color with 3 oval lips, and a smooth finly striated cuticle.
    Ascaris lumbricoides
  29. Which sex of A. lumbricoides has a curled tail with 2 copulatory spicules?
  30. Which sex of A. lumbricoides has paired reproductive organs in its posterior two thirds.
  31. Which A. lumbricoides ova is round, ovid, yellow brown, thick shell covered by mammillated, albuminous coat, and a yolk with cleavage?
    Corticated fertile
  32. Which A. lumbricoides ova is similar to corticated fertile but has no albuminous coat, and a smooth decorticate surface?
    Decorticated fertile
  33. Which A. lumbricoides ova is longer and narrow with amorphous yolk mass, and an irregular albuminous coat.
    Corticated non fertile
  34. Which A. lumbricoides ova is elongated, has amorphous yolk mass and no albuminous coat.
    decorticated non fertile
  35. Hookworms use what animal as almost an exclusive host.
  36. adult hookworms reside in what part of the body?
    small intestines
  37. Hookworm ova develop into rhabitiform larva in favorable environment, then they molt into _______ larva, this is the infective form.
  38. How do filariform Hookworm larva enter the body?
    • hair follicles
    • pores
    • unbroken skin (feet)
  39. Once hookworms are in the small intestines, they eat _______ and develop eggs which are passed in the feces.
  40. Hookworms cause these erythemic spots at the site of entry knwon as ground itch or dew itch.
  41. Hookworms suck blood causing what type of anemia?
  42. Adult tapeworms are small, cylindrical, ___________ at both ends, grayish white with thick cuticle.
  43. What is the morphologic difference between the two Hookworm species?
    buccal capsule
  44. Which hookworm species has a dorsal pair of semilunar cutting plates, concave tooth, and triangular lancets.
    N. americanus
  45. Which hookworm species has a ventral pair of teeth?
    A. duodenale
  46. Which sex of hookworm has a broad, translucent membranous caudal bursa with riblike rays for attachment during copulation.
  47. Which sex of hookworm is larger with a pointed tail?
  48. Ova of these nematoda cannot be differentiated between the two species. It has a thin transparent shell and 2-8 cell stages of division.
  49. How are Hook worm rhabditiform larva differentiated from S. stercoralis?
    Larger, more slender
  50. How are Filariform larva of Hookworm differentiated from S. stercoralis?
    • shorter esophagus
    • no notched clefts
  51. This Nematoda has three types of life cycles. Direct, which is the parasitic cylce, Indirect, in which it is free living, and auto infection which is in the host.
    Strongyloides stercoralis
  52. This nematoda is asociated with Conchin-china diarrhea, which may cause chronic dysentery and weightloss in heavy infection.
    Strongyloides stercoralis (strongyloidiasis)
  53. S. stercoralis is contracted by _____ penetration by filariform larva that migrates to the lungs and is fatal to immunocompromised host.
  54. The rhabitiform larva of this nematoda has an hour-glass shaped esophagus, and a short buccal cavity.
    Stronglyloides stercoralis
  55. This form of S. stercoralis is rarely seen in feces and has a notched tail.
    Filariform larva
  56. Humans are the only known host of this nematoda, adults live freely in the large and small intestines and there is no larval migration.
    Enterobius vermicularis
  57. E. vermicularis ova are swallowed or inhaled by hand to mouth during ________ scratching.
  58. E. vermicularis causes these two conditions characterized by puritis and pelvic inflammation, half of cases are asymptomatic.
    • Enterobiasis
    • Oxyuriasis
  59. This is the most common helminth infection in US.
    Enterobius vermicularis
  60. Grinding of teeth in sleep is associated with this nematoda (if symptomatic) as well as poor appetite, sleep and weight loss, abdominal pain and N/V.
    Enterobius vermicularis
  61. Adults of this nematoda have a pair of lateral cephalic alar. Males have a curved tail with a single spicule, females have long, pointed tail and prominent esophageal bulb.
    Enterobius vermicularis
  62. Ova of this organism are oval shaped and flat on one side with a classic asymmetric loaf of bread appearance, may contain developed larva.
    Enterobius vermicularis
  63. This is the most reliable, wide used method to detect Enterobius vermicularis.
    cellulose tape (Grahm scotch tape)
  64. true or false
    Enterobius vermicularis IS diagnosed with O/P.
  65. The scoth tape collecitons must be done before AM bath or __________.
  66. in the Scotch tape procedure, tape is looped over what sticky side out?
    tounge depressor
  67. This may be added to slides for scotch tape procedure in order to clear prepartion.
    • toluene
    • xylene
  68. Scotch tape procedure should be done for __ consecutive days.
  69. This Nematode has spear like projections, ova emryonate in soil is the infective stage.
    Trichuris trichiura
  70. Infection by this Nematode is characterized by blood streaked diarrhea, abdominal pain, anemia, weight loss and rectal prolapse that may be fatal.
    Trichuris trichiura (whipworm)
  71. The ova of the Nematode is oval (football/lemon shaped), barrel with mucoid plugs on each end, yellow to brown
  72. Adults of this Nematode are shaped like a whip with an anterior esophagus and posterior intestine and reproductinve organs.
    Trichuris trichiura (whipworm)
  73. Which sex of Trichuris trichiura has a curved tail with single spicule and retractile sheath
  74. which sex of Trichuris trichiura has a bluntly rounded posterior end.
  75. This nematoda uses humans, hogs, rats, bears, dogs, and cats as a reservoir. Larva encysts in striated muscle of raw or undercooked meat (pork)
    Trichinella spiralis
  76. When males and females of this Nematode copulate the male is expelled and the female produce live larva in the blood.
    Trichinella spiralis
  77. This Nematoda causes diarrhea, gastroenteritis, muscular pain, periorbital edema and overwhelming infection is fatal.
    Trichinella spiralis
  78. Muscle biopsy and serological testing is used to identify what Nematoda?
    Trichinella spiralis
  79. Filarial worms are ______ transmited, creamy white worms. females are twoice the male size.
  80. These types of Nematoda have inconspicuous buccal cavit with no lips, cylindrical esophagus, female gives birth to prelarval microfilariae.
    Filarial worms
  81. This Nematoda requires a mosquito, adult worms located in lymphatics.
    Wuchereria bancrofti
  82. This nematoda cuases varicose lymphatics and elephantiasis in 10% of cases.
    Wuchereria bancrofti
  83. This Nematoda is identified by thick and thin smear, sheath present, nuclei do not extgend to tip of tail
    Wuchereria bancrofti
  84. Humans and monkeys are the definite host of this Nematoda transmitted by the mango fly.
    Loa loa (eye worm)
  85. what is the species of Loa loa ingested by the mango fly?
    chrysops spp.
  86. Loa loa is found in __________ tissues and gains access to blood stream.
  87. This is a hypersensitivity to secretions of adult Loa loa worms.
    calabar swellings
  88. This nematoda is limted to the afrcan rain forest and causes meningo-encephalitis due to adult worms in CSF.
    Loa loa (eye worm)
  89. This threadlike cylindrica Nematoda has a singly stylet at anteroir end. nuclei extend to the tip of the tail and biopsy of subcutaneous tissue is required to ID.
    Loa loa (eye worm)
  90. This nematoda gives birth to microfilaria in nodules, which are ingested by Simulium spp. (black fly) during blood meal.
    Onchocerca volvulus (river blindness)
  91. This Nematoda causes inflammatory reaction, nodules of varying size and eye lesions called onchocerciasis.
    Onchocerca volvulus (river blindness)
  92. This Nematoda is found in tissue scrapings of nodules, does not have a sheath and no nuclei in either end. Diagnosis is made by finding adult in excised nodules.
    Onchocerca volvulus (river blindness)
  93. Adults of this Nematoda are found in subcutaneous tissues especially lower extremities, it is found in contact with fresh water.
    Dracunculus medinensis (guinea fireworm)
  94. This Nematoda is accidental ingestion of microcrustaceans (copepods), gravid femal migrate to lower extemities.
    Dracunculus medinensis (guinea fireworm)
  95. This Nematoda secretes toxin which cause localized infection, allergic reaction and anaphylactic shock. secondary infectiosn include ulcers, worm dies if it fails to reach skin.
    Dracunculus medinensis (guinea fireworm)
  96. What is the sex of Dracunculus medinensis that is present in skin lesions?
  97. What is the blood smear preparation where 1 ml of blood is drawn, and poured into tube containing 9 ml of 2% formalin to kill microfilaria, and let stand for 12-24 hours. centrifuge, decant and spread on slide uniformly.
    Knott procedure
  98. Slides for knott procedure is stained for 45 minutes and de-stain for 10-15 minutes in ____ pH water. airdry and examined using 100x.
    7.2 pH
Card Set
Intestinal and Tissue Roundworms Class Nematoda 5.6
Parasitology Unit 5.6 Intestinal and Tissue Roundworms Class Nematoda