Intestinal Nematodes 3
OUTLINE Male • 2 to 5 mm by
I. Enterobius vermicularis II. Capillaria philippinensis 0.1 to 0.2 mm
A. Morphology A. Morphology • curved tail and
B. Lifecycle B. Lifecycle a single spicule
C. Pathology C. Pathology • die after
D. Laboratory diagnosis D. Laboratory diagnosis copulation
E. Treatment E. Treatment • Shorter
F. Prevention & control F. Prevention & control
Red italicized =- Doc’s verbatim
• The males are always smaller than the females
I. Enterobius vermicularis • Purpose of the coiling of the tale for male: grasp the
▪ Pinworm, seatworm “bitok” female firmly during intercorse
▪ Enterobiasis, oxyuriasis • Male spicule is to keep the vagina/ vulva open during
▪ An urban disease of children in crowded sexual intercourse
environment. • The adults can be easily indentfied by the presence of
▪ Adults may get it from their children. an extension called cuticular alar expansion which is
▪ Characterized by perianal itching or pruritus ani. not present in another parasite. Modification, in their
▪ Classified: meromyarian anterior portion near the mouth and there will be that
expansion of the outermost covering the cuticle
• In our dialect it is called “kigwa” (hypodermis- responsible for the production of the
• The most common clinical manifestation is anal cuticle layer).
pruritus or anal itching • More prominent morphologic feature of the adult
• The disease that is produce: enterobiasis or enterobius is enlargement of the posterior portion of
oxyuriasis esophagus. Esophagus does not only serve as
passageway for the ingested food particles. It also
serves as there pancreas where digestive enzymes are
A. Morphology produced.
▪ Adult worms have cuticular alae/ cephalic alae
expansions at the anterior end and a prominent Larva
posterior esophageal bulb • Rhabditiform larva- measuring 140 to 150 µm by 10
µm, has the characteristic esophageal bulb, but has no
cuticular expansion on the anterior end.
Egg
• Asymmetrical with one side flattened other side
convex
• Range from 50 to 60 µm by 20 to 30 µm in size
averaging 55 by 36 µm
• Characteristic shape: letter D. Egg is flat on one side
and convex on the other side. With embryos developing
Female • 8 to 13 mm by inside.
0.4 mm
• long pointed
tail
• uteri of gravid
females are
distended with
eggs
• Longer
• Outer: 3 albuminous layers
- mechanical protection
!"#$% &5! !"#$%!'#()*)+" ,-. Page 1 of 4
OUTLINE Male • 2 to 5 mm by
I. Enterobius vermicularis II. Capillaria philippinensis 0.1 to 0.2 mm
A. Morphology A. Morphology • curved tail and
B. Lifecycle B. Lifecycle a single spicule
C. Pathology C. Pathology • die after
D. Laboratory diagnosis D. Laboratory diagnosis copulation
E. Treatment E. Treatment • Shorter
F. Prevention & control F. Prevention & control
Red italicized =- Doc’s verbatim
• The males are always smaller than the females
I. Enterobius vermicularis • Purpose of the coiling of the tale for male: grasp the
▪ Pinworm, seatworm “bitok” female firmly during intercorse
▪ Enterobiasis, oxyuriasis • Male spicule is to keep the vagina/ vulva open during
▪ An urban disease of children in crowded sexual intercourse
environment. • The adults can be easily indentfied by the presence of
▪ Adults may get it from their children. an extension called cuticular alar expansion which is
▪ Characterized by perianal itching or pruritus ani. not present in another parasite. Modification, in their
▪ Classified: meromyarian anterior portion near the mouth and there will be that
expansion of the outermost covering the cuticle
• In our dialect it is called “kigwa” (hypodermis- responsible for the production of the
• The most common clinical manifestation is anal cuticle layer).
pruritus or anal itching • More prominent morphologic feature of the adult
• The disease that is produce: enterobiasis or enterobius is enlargement of the posterior portion of
oxyuriasis esophagus. Esophagus does not only serve as
passageway for the ingested food particles. It also
serves as there pancreas where digestive enzymes are
A. Morphology produced.
▪ Adult worms have cuticular alae/ cephalic alae
expansions at the anterior end and a prominent Larva
posterior esophageal bulb • Rhabditiform larva- measuring 140 to 150 µm by 10
µm, has the characteristic esophageal bulb, but has no
cuticular expansion on the anterior end.
Egg
• Asymmetrical with one side flattened other side
convex
• Range from 50 to 60 µm by 20 to 30 µm in size
averaging 55 by 36 µm
• Characteristic shape: letter D. Egg is flat on one side
and convex on the other side. With embryos developing
Female • 8 to 13 mm by inside.
0.4 mm
• long pointed
tail
• uteri of gravid
females are
distended with
eggs
• Longer
• Outer: 3 albuminous layers
- mechanical protection
!"#$% &5! !"#$%!'#()*)+" ,-. Page 1 of 4
