Larval Cestodes Flashcards

Mesocestoides “lineatus” sp.
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Mesocestoides “lineatus” sp.
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium
Main features of
Cyclophyllidae
(Mesocestoides, Taenia, Echinococcus spp.)
- Live a adults in carnivorous mammals or humans
- Usually do not cause harmful effects in the final host
- Usually no symptoms occurs in the intermediate hosts
- They live for years in the intermediate hosts but the lifespan is shorter in the final host

Mesocestoides larva
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Mesocestoides larva
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Mesocestoides larva
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Mesocestoides lineatus
Segments
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Mesocestoides lineatus
Segments
FH: Dogs/Foxes
IH: Arthropods (mites & insects)/Lower vertebrates
(frogs, lizards, birds)
Cysticercoid & Tetrathyridium

Taenia sp. & Echinococcus sp.
Similar head part:
- Scolex
- Hooks
- Rostrellum

Taenia sp.
Number of hooks is characteristic for each species
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Number of hooks is characteristic for each species
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Number of hooks is characteristic for each species
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
1 genital opening in each segment
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Segments
Left: Immature
Middle: Mature
Right: Gravid with eggs
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Mature segment
Genitals + One genital opening
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Mature segment
Genitals + One genital opening
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Mature segment
Genitals + One genital opening
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Mature segment
Genitals + One genital opening
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia sp.
Gravid segment
Full of eggs
IH: Mammals
(larval multiplication in them: occurs or not)

Taenia pisiformis
Gravid segment
Full of eggs
FH: Dogs & Foxes
IH: Rabbits & Hares
No larval multiplication in intermediate host

Taenia pisiformis
Gravid segment
Full of eggs
FH: Dogs & Foxes
IH: Rabbits & Hares
No larval multiplication in intermediate host

Taenia pisiformis
Gravid segment
Colour depends on bile duct colour
FH: Dogs & Foxes
IH: Rabbits & Hares
No larval multiplication in intermediate host

Different egg structure of Cestodes
with 6-hooked Oncosphere inside
*Diphyllobothrium has zygote instead of oncosphear*

Taenia type egg
6-hooked oncosphere inside

Taenia type egg
6-hooked oncosphere inside

Taenia type egg
6-hooked oncosphere inside

Taenia saginata
Egg
Super tiny
6-hooked oncosphere inside

Taenia saginata
Egg
Super tiny
6-hooked oncosphere inside

Cysticercus pisiformis
Evaginated, fully developed with opened capsule
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Hepatophilic larvae - Haemorrhagic tracks
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Hepatophilic larvae - Haemorrhagic tracks
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Subacute infection of rabbit liver with developing cysicerci
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Mature cysticercus larva developed only on the surface of liver
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Liver cross section
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Cross section of liver
No cyst wall around cysticercus
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Cross section of liver
No cyst wall around cysticercus
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus pisiformis
Mature cysticerci on serosal surface of peritoneum
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Taenia sp.
Larval hooks are eqiuvalent and exactly as same as that the hooks of the adult worm

Cysticercus pisiformis
Hooks
Taenia pisiformis
FH: Dogs & Foxes
IH: Rabbits & Hares
No multiplication in intermediate host

Cysticercus tenuicollis
Surface of liver of deer with a scolex
Taenia hydatigena
FH: Dogs, Wolves, Foxes
IH: Ungultes
No multiplication in intermediate host

Cysticercus tenuicollis
Taenia hydatigena
FH: Dogs, Wolves, Foxes
IH: Ungultes
No multiplication in intermediate host

Cysticercus tenuicollis
Taenia hydatigena
FH: Dogs, Wolves, Foxes
IH: Ungultes
No multiplication in intermediate host

Strobilocercus fasciolaris
Taenia taeniaeformis
FH: Cats
IH: Rodents
No multiplication in intermediate host

Strobilocercus fasciolaris
Taenia taeniaeformis
FH: Cats
IH: Rodents
No multiplication in intermediate host

Life cycle of Human tapeworms
Taenia saginata & Taenia solium
FH: Humans
IH: Cattle (saginata), Swine/Humans (solium)
Cysticercus bovis (T. saginata) & Cysticercus cellulosae (T. solium) No multiplication in intermediate host

Cysticercus bovis
Taenia saginata
FH: Humans
IH: Cattle
No multiplication in intermediate host

Cysticercus bovis
Masseter muscle infection
Taenia saginata
FH: Humans
IH: Cattle
No multiplication in intermediate host

Cysticercus bovis
Heart muscle infection
Taenia saginata
FH: Humans
IH: Cattle
No multiplication in intermediate host

Cysticercus bovis
Dead cysticercus
Taenia saginata
FH: Humans
IH: Cattle
No multiplication in intermediate host

Cysticercus bovis
Taenia saginata
FH: Humans
IH: Cattle
No multiplication in intermediate host

Cysticercus cellulosae
Egg –> L2
Taenia solium
FH: Humans
IH: Swine/Humans
No multiplication in intermediate host

Cysticercus cellulosae
Heart muscle cross section
Taenia solium
FH: Humans
IH: Swine/Humans
No multiplication in intermediate host

Cysticercus cellulosae
Heart muscle infection
Taenia solium
FH: Humans
IH: Swine/Humans
No multiplication in intermediate host

Cysticercus cellulosae
Human eye infection
Taenia solium
FH: Humans
IH: Swine/Humans
No multiplication in intermediate host

Cysticercus cellulosae
Brain infection
Taenia solium
FH: Humans
IH: Swine/Humans
No multiplication in intermediate host

Cysticercus cervi
Skeletal muscle infection
Taenia cervi
FH: Foxes, Wolves & Dogs
IH: Red deer, Roe deer
No multiplication in intermediate host

Cysticercus cervi
Skeletal muscle infection
Taenia cervi
FH: Foxes, Wolves & Dogs
IH: Red deer, Roe deer
No multiplication in intermediate host

Cysticercus longicollis
Abdominal cavity of rodent
Taenia crassiceps
FH: Foxes
IH: Rodents
Larval multiplication with external budding in intermediate host

Cysticercus longicollis
Taenia crassiceps
FH: Foxes
IH: Rodents
Larval multiplication with external budding in intermediate host

Cysticercus longicollis
Taenia crassiceps
FH: Foxes
IH: Rodents
Larval multiplication with external budding in intermediate host

Cysticercus longicollis
Larva in human eye
Taenia crassiceps
FH: Foxes
IH: Rodents
Larval multiplication with external budding in intermediate host

Coenurus cerebralis
Taenia multiceps
FH: Dogs
IH: Sheep
Larval multiplication with internal budding in intermediate host

Coenurus cerebralis
Taenia multiceps
FH: Dogs
IH: Sheep
Larval multiplication with internal budding in intermediate host

Coenurus cerebralis
Brain infection
Taenia multiceps
FH: Dogs
IH: Sheep
Larval multiplication with internal budding in intermediate host

Coenurus cerebralis
Opisthotonus
Taenia multiceps
FH: Dogs
IH: Sheep
Larval multiplication with internal budding in intermediate host

Coenurus serialis
In CT under skin and among muscles
Taenia serialis
FH: Dogs, Wolves & Foxes
IH: Rabbits & Hares
Larval multiplication with internal budding in intermediate host

Echinococcus granulosus & Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval echinococcus
e. hydatidosus (E. granulosus) –> Unilocular hydatid cyst
e. alveolaris (E. multilocularis) –> Alveolar hydatid cyst
* *Larval multiplication** with exogenous and endogenous budding in intermediate host

Echinococcus granulosus
Adult worm - 3 segments
FH: Canines
IH: Mammals
Larval echinococcus
echinococcus hydatidosus –> Unilocular hydatid cyst
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus granulosus
Adult worm - 3 segments
FH: Canines
IH: Mammals
Larval echinococcus
echinococcus hydatidosus –> Unilocular hydatid cyst
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus granulosus
Adult worm - 3 segments
FH: Canines
IH: Mammals
Larval echinococcus
echinococcus hydatidosus –> Unilocular hydatid cyst
Larval multiplication with exogenous and endogenous budding in intermediate host

Life cycle of
Echinococcus granulosus&Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval echinococcus
e. hydatidosus (E. granulosus) –> Unilocular hydatid cyst
e. alveolaris (E. multilocularis) –> Alveolar hydatid cyst
* *Larval multiplication** with exogenous and endogenous budding in intermediate host

Echinococcus granulosus/Echinococcus multilocularis
Adult worms in the intestine
FH: Canines
IH: Mammals
Larval echinococcus
e. hydatidosus (E. granulosus) –> Unilocular hydatid cyst
e. alveolaris (E. multilocularis) –> Alveolar hydatid cyst
* *Larval multiplication** with exogenous and endogenous budding in intermediate host

Echinococcus granulosus
Adult worm in the intestine - 3 segments
FH: Canines
IH: Mammals
Larval echinococcus
e. hydatidosus (E. granulosus) –> Unilocular hydatid cyst
e. alveolaris (E. multilocularis) –> Alveolar hydatid cyst
* *Larval multiplication** with exogenous and endogenous budding in intermediate host

Taenia type eggs
6-hooked oncosphere inside

Echinococcus hydatidosus
Protoscolex
Unilocular hydatid cyst
Echinococcus granulosus
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Cysticercous Vs. Echinococcus
The wall around a cysticercous larval is always missing

Echinococcus hydatidosus
Hydatid cyst in lung
Cysticercous Vs. Echinococcus
The wall around a hydatid larval is always multi layered
Echinococcus granulosus
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus hydatidosus
Hydatid cyst (& Dicrocoelium) in liver
Hydatid cyst has brood caps, Dicrocoelium has eggs
Echinococcus granulosus
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus cyst
The wall around a hydatid larval is always multi layered
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Dicrocoelium cyst
Eggs inside

Echinococcus cyst
Brood caps inside

Echinococcus hydatidosus
Hydatid cyst (& Dicrocoelium) in liver Hydatid cyst has brood caps, Dicrocoelium has eggs
Echinococcus granulosus
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus hydatidosus
Collapsed hydatid cyst in liver
Hydatid cyst has brood caps, Dicrocoelium has eggs
Echinococcus granulosus
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Cysticercosis
Cysts are sitting on capsule of liver
(Echinococcosis: cysts are sunken into parenchyma )

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcosis
Cysts are sunken into parenchyma
(Cysticercosis: cysts are sitting on capsule of liver)

Echinococcus alveolaris
Alveolar hydatid cyst
Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus alveolaris
Sterile form of alveolar echinococcosis:
gelatinous mass in caverns
Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus alveolaris
Fertile form of alveolar echinococcosis:
protoscolex in caverns
Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate host

Echinococcus alveolaris
Alveolar hydatid cyst
Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval multiplication with exogenous and endogenous budding in intermediate

Echinococcus alveolaris
Alveolar hydatid cyst
Echinococcus multilocularis
FH: Canines
IH: Mammals
Larval multiplication with e_xogenous and endogenous budding_ in intermediate