[Elizabeth_Zeibig]_Clinical_Parasitology__A_Practi(z-lib.org)

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CHAPTER 8 The Nematodes
practitioners be cognizant of the specific diagnostic
stage(s) of each nematode life cycle.
Several major differences in size, shape, and
internal features help distinguish the nematode
morphologic forms. These characteristics may
best be compared at the end of this chapter in
three composite drawings grouped by morphologic
form—eggs, larvae, and adults.
TEST YOUR KNOWLEDGE!
8-1. For each nematode listed below (column
A), select the corresponding common
name (column B). (Objective 8-3)
Column A
A. Trichinella
spiralis
B. Trichuris
trichiura
C. Enterobius
vermicularis
D. Dracunculus
medinensis
E. Necator
americanus
Column B
1. Hookworm
2. Guinea worm
3. Trichina worm
4. Pinworm
5. Roundworm of man
6. Whipworm
7. Threadworm
8-2. The eggs of which group of nematodes are
indistinguishable? (Objective 8-12)
A. Whipworm and trichina worm
B. Hookworm and threadworm
C. Guinea worm and roundworm of man
D. Pinworm and whipworm
8-3. Once inside a human, these two nematodes
take up residence outside the intestinal
tract. (Objective 8-12)
A. Enterobius vermicularis and Strongyloides
stercoralis
B. Necator americanus and Ancylostoma
duodenale
C. Dracunculus medinensis and Trichinella
spiralis
D. Trichuris trichiura and Ascaris
lumbricoides
8-4. Match each nematode (column A) with
the name of its corresponding common
disease or condition (column B). (Objective
8-7)
Column A
Column B
A. Roundworm of 1. Ascariasis
man
B. Whipworm 2. Trichina worm
C. Hookworm 3. Trichuriasis
D. Pinworm 4. Ancylostomiasis
E. Guinea worm 5. Enterobiasis
6. Dracunculosis
8-5. These two nematodes are similar in
that they are both suspected of being
transport hosts of Dientamoeba fragilis.
(Objective 8-12)
A. Trichinella and Dracunculus
B. Necator and Trichuris
C. Strongyloides and Ancylostoma
D. Ascaris and Enterobius
8-6. The eggs of these two nematodes are never
to rarely seen in stool samples. (Objective
8-12)
A. Trichina and threadworm
B. Whipworm and roundworm of man
C. Guinea worm and pinworm
D. Threadworm roundworm and
hookworm
8-7. Match each nematode (column A) with
its key distinguishing characteristic in the
egg morphologic form (column B). (Objective
8-10)
Column A
Column B
A. Ascaris 1. Flattened on one
side
B. Anyclostoma 2. Obvious albuminous
coating
C. Enterobius 3. Surrounded by a
nurse cell
D. Trichuris 4. Thin shell
surrounding
embryonic cleavage
5. Polar plug on each
end