FINALS: INTESTINAL CESTODES II Flashcards
- Common tapeworm of rats
- Family Davainidae
Raillietina garrisoni
DH OF R. garrisoni
RATS
IH OF R. garrisoni
Flour beetle (Tribolium confusum)
TREATMENT FOR R. garrisoni
PRAZIQUANTEL
given to children to pass
out worms
- Worms may pass without treatment
- 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
Dipylidium caninum
DH OF Dipylidium caninum
Dogs or cats
IH OF Dipylidium caninum
o Ctenocephalides canis (dog flea)
o Ctenocephalides felis (cat flea)
o Pulex irritans (human flea)
o Trichodectes canis (dog louse)
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
8 - 15 eggs
TREATMENT OF CHOICE FOR DIPYLIDIASIS?
PRAZIQUANTEL
o 5-10 mg/kg single dose
- Order pseudophyllidea
- Commonly called as broad/fish tapeworm
- Largest tapeworm of man
Diphyllobothrium latum
- 66 by 44 um
- Yellowish brown
Inconspicuous operculum - Small knob-like thickening
- Develops in water – Coracidium
- Moderately thick shell
Diphyllobothrium latum OVA
- Ciliated embryo, free swimming
- Ingested by 1st intermediate host
CORACIDIUM
o INFECTIVE STAGE FOR 2ND IH
o Measures 550 um
o In 1st intermediate host
Procercoid
o INFECTIVE STAGE FOR DEFINITIVE HOST
o Aka sparganum
o In 2nd intermediate host
o Measures 20mm or more
Plerocercoid
Diphyllobothrium latum IH
o 1st: copepods
Cyclops spp
Diaptomus spp
o 2nd : freshwater and brackish water fish
Diphyllobothrium latum PARATENIC HOSTS?
o Carnivorous fish
Perch, trout, salmon,
pike
Diphyllobothrium latum DH
o Humans
o Dogs
o Cats
o Other mammals
Diphyllobothrium latum EGGS WILL MATURE IN
18 - 20 DAYS
Diphyllobothrium latum
Eggs may appear in the feces______ after infection
5-6 weeks
Examination of gastric juice
+ ?
diphyllobothriasis (presence of
hydrochloric acid)
Examination of gastric juice
- ?
pernicious anemia - associated
with achlorhydria (lack of
hydrochloric acid of stomach)
TREATMENT OF CHOICE FOR DIPHYLLOBOTHRIASIS?
Praziquantel
o 5-10 mg/kg single dose
Criteria for recovery FOR DIPHYLLOBOTHRIASIS?
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
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
Raillietina garrisoni
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
Dipylidium caninum
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)
Diphyllobothrium latum
