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PARASITOLOGY > FINALS: INTESTINAL CESTODES II > Flashcards

FINALS: INTESTINAL CESTODES II Flashcards

1
Q
  • Common tapeworm of rats
  • Family Davainidae
A

Raillietina garrisoni

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2
Q

DH OF R. garrisoni

A

RATS

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3
Q

IH OF R. garrisoni

A

Flour beetle (Tribolium confusum)

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4
Q

TREATMENT FOR R. garrisoni

A

PRAZIQUANTEL

given to children to pass
out worms

  • Worms may pass without treatment
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5
Q
  • Double pore tapeworm/dog tapeworm
  • In humans, it is an ACCIDENTAL PARASITE
    where it is common in children than adults
  • Requires intermediate host
    In dog, it is considered as ECTOPARASITE
A

Dipylidium caninum

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6
Q

DH OF Dipylidium caninum

A

Dogs or cats

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7
Q

IH OF Dipylidium caninum

A

o Ctenocephalides canis (dog flea)
o Ctenocephalides felis (cat flea)
o Pulex irritans (human flea)
o Trichodectes canis (dog louse)

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8
Q

Dipylidium caninum OVA APPEARANCE
In packets
- _______
- Enclosed in embryonic
membrane
o Eggs are spherical with a thin shelled with hexacanth embryo
o Filled with packets of eggs

A

8 - 15 eggs

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9
Q

TREATMENT OF CHOICE FOR DIPYLIDIASIS?

A

PRAZIQUANTEL

o 5-10 mg/kg single dose

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10
Q
  • Order pseudophyllidea
  • Commonly called as broad/fish tapeworm
  • Largest tapeworm of man
A

Diphyllobothrium latum

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11
Q
  • 66 by 44 um
  • Yellowish brown
    Inconspicuous operculum
  • Small knob-like thickening
  • Develops in water – Coracidium
  • Moderately thick shell
A

Diphyllobothrium latum OVA

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12
Q
  • Ciliated embryo, free swimming
  • Ingested by 1st intermediate host
A

CORACIDIUM

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13
Q

o INFECTIVE STAGE FOR 2ND IH
o Measures 550 um
o In 1st intermediate host

A

Procercoid

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14
Q

o INFECTIVE STAGE FOR DEFINITIVE HOST
o Aka sparganum
o In 2nd intermediate host
o Measures 20mm or more

A

Plerocercoid

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15
Q

Diphyllobothrium latum IH

A

o 1st: copepods
 Cyclops spp
 Diaptomus spp
o 2nd : freshwater and brackish water fish

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16
Q

Diphyllobothrium latum PARATENIC HOSTS?

A

o Carnivorous fish
 Perch, trout, salmon,
pike

17
Q

Diphyllobothrium latum DH

A

o Humans
o Dogs
o Cats
o Other mammals

18
Q

Diphyllobothrium latum EGGS WILL MATURE IN

A

18 - 20 DAYS

19
Q

Diphyllobothrium latum
Eggs may appear in the feces______ after infection

A

5-6 weeks

20
Q

Examination of gastric juice
+ ?

A

diphyllobothriasis (presence of
hydrochloric acid)

21
Q

Examination of gastric juice
- ?

A

pernicious anemia - associated
with achlorhydria (lack of
hydrochloric acid of stomach)

22
Q

TREATMENT OF CHOICE FOR DIPHYLLOBOTHRIASIS?

A

Praziquantel

o 5-10 mg/kg single dose

23
Q

Criteria for recovery FOR DIPHYLLOBOTHRIASIS?

A

o Recovery of scolex in the feces after treatment
o If the scolex is not recovered, a repeat stool examination is done after 3 months

24
Q

IDENTIFY:
- Scolex: minute, subglobular, with four
acetabula
- Rostellum: two alternating circular rows of 90-140 hammer-shaped hooks
- Number of ova per gravid proglottid: 2mm
in length with 200-400 egg capsules with
one to four spindle shaped eggs
- Length: 60cm
- Strobila: detachment by apolypsis
- Oncosphere of the egg has two thin membranes: one is outer elongated membrane and second is inner spherical membrane

A

Raillietina garrisoni

25
Q

IDENTIFY:
- Scolex: small and globular, with four deeply cupped suckers
- Rostellum: protrusible, club-shaped, armed with one to seven rows of rose thorn-shaped hooklets/spines
- Segments: bilateral genital pores
o Gravid segments detach in the strobila and may migrate to anus or passed through feces
- Length: 10-70cm
- Color: PALE REDDISH
- Proglottids: narrow with two sets of male
and female reproductive organs with bilateral genital pores

A

Dipylidium caninum

26
Q

IDENTIFY:
- Scolex: SPATULATE, two bothria (ALMOND SHAPED sucking grooves, located dorsally and ventrally)
o measures 2 to 3 mm in length by 1 mm in diameter
- Rostellum: UNARMED
- Segments: DARK, ROSETTE-like coiled uterus
o Disintegrates after completion of reproductive function
o Gravid: wider than long (measures 2 to 4 mm in length by 10 to 12 mm in width)

A

Diphyllobothrium latum

PARASITOLOGY (23 decks)

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