f asciola h epatica amy liberio heather peters. f asciola hepatica one of the worlds largest fluke...
DESCRIPTION
G EOGRAPHICAL D ISTRIBUTION Worldwide (excluding Antarctica) Where sheep or cattle are raisedTRANSCRIPT
FASCIOLA HEPATICAAmy LiberioHeather Peters
FASCIOLA HEPATICA One of the world’s largest fluke
Worm: 30 mm x 13 mm Distinguishable from other faciolidae by:
Oral cone “Shoulders”
Widening of body at base of oral cone Highly branched ceca
GEOGRAPHICAL DISTRIBUTION Worldwide (excluding Antarctica)
Where sheep or cattle are raised
HOSTS
Definitive host: sheep, cattle Accidental host: humans
Intermediate hosts: snails
MORPHOLOGICAL FORMS Fluke (worm) Eggs Micracidium Sporocyst Rediae Cercariae Metacercaria
Hermaphroditic
LIFE CYCLE
LIFE CYCLE Metacercariae ingested Young flukes released from cyst in digestive
tract Adult fluke moves to bile ducts Eggs are released and passed in feces Eggs develop in water and hatch miracidium Miracidium penetrates snail Mother sporocyst produce daughter rediae Daughter rediae produce cercariae Cercariae released in water Cercariae encyst and become metacercariae
INFECTION AND SIGNS Symptoms:
Gastrointestinal problems: Nausea Vomiting Abdominal pain/tenderness
Fever Rash Difficulty breathing Anemia Migrating juveniles can produce ulcers in eyes,
brain, skin and lungso Can eventually lead to Fascioliasis
DIAGNOSIS AND TREATMENTo Diagnosis:
o Eggs in stool sample (after a few months)o Enzyme-linked immunosorbent assay (ELISA)o Antibodies in blood sample
o Treatment:o Prescription drugs
o Rafoxanideo Trichlabendazole
o No vaccine
ECONOMIC IMPORTANCE Huge issue in cattle and sheep industries
Lowered productivity Lowered fertility Lowered quality of animal products
PREVENTION & CONTROL Control growth and sale of watercress and other
water plants Avoid potentially contaminated water and/or food Cook vegetables well that were possibly grown
with contaminated water
REVIEW What is a definitive host for F. Hepatica?
What are a few symptoms?
What morphological form is considered infective?
What is one way to prevent infection?