Trematodes Flashcards
Three characteristics of adult trematodes
Non-segmented
Flattened
Leaf-like
Intestinal Species
Fasciolopsis buski
Heterophyes hetrophyes
Metagonimus yokogawai
Liver species
Fasciola hepatica
Clonorchis sinensis
Lung Species
Paragonimus westermani
Blood Species
Schistosoma mansoni
Schistosoma japonicum
Schistosoma haematobium
Fasciolopsis buski
Large Intestinal Fluke
Heterophyes heterophyes
Heterophyid Fluke
Metagonimus yokogawai
Yokogawai’s Fluke
Fasciola hepatica
Sheep Liver Fluke
Clonorchis sinensis
Chinese Liver Fluke
Paragonimus westermani
Oriental Lung Fluke
Schistosoma mansoni
Manson’s Blood Fluke
Schistosoma japonicum
Blood Fluke
Schistosoma haematobium
Bladder Fluke
Another name for trematodes
Dignea
Parasites that reproduce via separate sexes
Dioecious
The general term for human infection of flukes
Distosomiasis
A lid like structure present on SOME fluke eggs
Operculum
Presence and location of spines distinguish _____________ species
Schistosoma
All adults except Schistosomes are (3):
Clue: LHT
Leaf-like
Hermaphroditic
Typically food-borne
Dioecious fluke species
Schistosomes
Schistosomes enter humans through
Direct penetration
All trematode life cycles require this as an intermediate host
Snails
Two categories of Trematodes:
Organ-dwelling
Blood-dwelling
In organ dwelling flukes, infection occurs when?
After ingestion of contaminated:
Water plants
Crab
Crayfish
Fish
In organ-dwelling flukes, adults are found in:
Clue: IBL
Intestines
Bile duct
Lungs
In organ-dwelling species, eggs may be passed in:
Stool
Sputum
All flukes but Schistosomes are ___________ dwelling.
Organ
Contents of egg
Miracidium
Larval stage
Sporocyst containing rediae
Final stage larvae
Cercariae
The miracidium penetrate specific ___________ species
Snail
Sporocyst containing _____________ forms
Rediae
_______________ emerge from snail and enter water plant, fish, crab, or crayfish.
Cercariae
Blood-dwelling flukes
Schistosomes
Schistosomes initiate infection through
Penetration of cercariae larva into the skin while swimming in contaminated water
After initiating infection, schistosomes emerge into __________ form.
Schistosomule
Schistosomes take up residence in blood vessels around:
Clue: LIU
Liver
Intestinal tract
Urinary bladder
In blood dwelling flukes, eggs spill into:
Stool/
Urine
Specimen of choice for trematodes if species-dependent:
Clue: FR. SUD
Feces Rectal biopsy Sputum Urine Duodenal drainage
__________ tests are also available in diagnosing trematode/trematode infection.
Serologic
Symptoms vary by:
Infection
Affected area
General symptoms of distosomiasis
Clue: DJ TAE
Diarrhea Jaundice Tissue damage Allergic and toxic reactions Eosinophilia
Phylum of trematodes
Platyhelminthes
Shape, egg content, and other features of of F. buski and F. hepatica egg
Somewhat oblong
Undeveloped miracidium
Presence of a distinct operculum
Larger and has no shoulder (adult).
a. Fasciolopsis buski
b. Fasciola hepatica
a. Fasciolopsis buski
Smaller and with shoulder (adult).
a. Fasciolopsis buski
b. Fasciola hepatica
b. Fasciola hepatica
Specimen of choice for F. species
Stool
Eggs are distinguishable for F. species.
True or False?
False.
They are indistinguishable
Methods to recover adult Fasciola.
Clue: GEE
Gel diffusion
Enterotest
ELISA
Speciation of F. species can be done via __________
Recovery of adult Fasciolopsis worm