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Parasitology Lab 4

Trematodes
by

Mohamed Malash

on 22 February 2015

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Transcript of Parasitology Lab 4

Medical Helminthology
lab 4
Classification of Human Parasites
Protozoology
Study of protozoa (primitive animals)
Helminthology
Study of helminths (worms)
Entomology
Study of arthropods
Round worms
(Nemathelminthes)
Flat worms
(Platyhelminthes)
Class:
Nematoda
Class:
Trematoda
(Flukes)
Class:
Cestoda
(Tape worms)
Fasciola hepatica
Fasciola gigantica


Name of the parasite.
Classification of the parasite.
Intermediate and definitive host.
Infective stage.
Mode of transmission.
Location in the host.
Lab diagnosis (Diagnostic stage).
Disease.
Questions Forms
General Characteristics of Trematodes
Fasciola spp.
Classification of Trematodes Types of Infections
Barrel shaped.
Largest egg among worms.
Has operculum (for hatching).
Immature content.
Fasciola sp. Immature egg found in stool (diagnostic stage)
Fasciola gigantica
Fasciola hepatica
Less prominent shoulders.
Parallel margins.
Larger in size.
In cattle raising areas.
Prominent shoulders.
Converging margins.
Smaller in size.
In sheep raising areas.
Fasciola hepatica adult worm found in bile ducts
Fasciola hepatica adult worm seen by naked eye
Lymneae cailliaudi snail; the intermediate host of F. gigantica
Fasciola hepatica cercaria
Fasciola sp. metacercaria on a water plant (infective stage)
Fasciola spp.
Classification:
Liver fluke.
Disease:
Fascioliasis.
Definitive host:
Sheep, cattle and human (accidental).
Intermediate host:
snail Lymnaea truncatula for F. hepatica and Lymnaea cailliaudi for F. gigantica.
Mode of transmission:
ingestion of raw water-cress containing encysted metacercariae.
Infective stage:
metacercariae.
Diagnostic stage:
immature egg in stool.
Location in human:
bile ducts.
Schistosoma spp.
Schistosoma haematobium
Schistosoma mansoni

Male and female Scistosoma mansoni
Gynecophoric canal
Schistosoma haematobium egg with terminal spine, found in urine (diagnostic stage)
Schistosoma haematobium egg with terminal spine, found in urine (diagnostic stage)
Schistosoma mansoni egg with lateral spine, found in stool (diagnostic stage)
Schistosoma mansoni egg with lateral spine, found in stool (diagnostic stage)
Bulinus truncatus snail (Intermediate host of S. haematobium)
Biomphalaria alexandrina snail, the intermediate host of S. mansoni)
Cercaria, the free swimming form of Schistosoma spp. (infective stage)
Forked tail
Cercaria, the free swimming form of Schistosoma spp. (infective stage)
Penetration gland
Schistosoma mansoni copulatory couple
Schistosoma haematobium egg in urinary bladder
Schistosoma mansoni eggs in liver
Schistosoma mansoni eggs lodged in large intestinal wall.
Schistosoma spp.
S. haematobium
S. mansoni
Classification:

Blood fluke.
Definitive host:

Human.
Infective stage:
Cercariae.
Mode of transmission:
direct skin penetration of cercariae during swimming.
Intermediate host:
Location in body:

Diagnostic stage:
Disease:
Biomphalaria alexandrina
veins of large intestine, colon (lower mesentric vein)
eggs in stool
Intestinal Bilharziasis
Bulinus truncatus
veins of urinary bladder (venous plexus of urinary bladder)

Eggs in urine
Urinary Bilharziasis
Heterophyes heterophyes
Heterophyes heterophyes adult worm found in small intestines.
Heterophyes heterophyes adult worm found in small intestines.
Both are present in Egypt
Pirenella conica snail; the first itermediate host of Heterophyes heterophyes.
Pirenella conica snail; the first itermediate host of Heterophyes heterophyes.
Grey Mullet fish; the second intermediate host of Heterophyes heterophyes.
Heterophyes heterophyes egg found in stool (diagnostic stage).
Heterophyes heterophyes egg found in stool (diagnostic stage).
Heterophyes heterophyes egg found in stool (diagnostic stage).
Heterophyes heterophyes metacercaria in fish flesh (infective stage)
Heterophyes heterophyes
Classification:

Intestinal fluke.
Disease:

heterophiasis.
Definitive host:

human and fish eating mammals and birds
.
Intermediate host:

First or primary is snail Pirenella conica and secondary is Mullet fish.
Mode of transmission:

ingestion of raw or undercooked fish containing encysted metacercaria.
Infective stage:

metacercariae.
Diagnostic stage:

mature egg in stool.
Location in human:

small intestines.
Questions???
Thank you :)
Mature egg
Miracidium
Sporocyst
Redia
Cercaria
General Life Cycle of Trematodes
In water
In snail
In water
Metacercaria
In definitive host
Full transcript