FINALS: Opistorchis species (Liver Flukes) Flashcards
“Southeast Asian liver fluke”
Opistorchis viverrini
“cat liver fluke”
Opistorchis felineus
Definitive host:
cats, dogs, other fisheating mammals
Intermediate host:
1st snail
Bithynia
2nd: freshwater fish
Cyprinidae
Cobitidae
Infective Stage:
metacercariae
Diagnostic Stage:
embryonated egg
• Operculated with prominent shoulders
• Has an abopercular knob
• Shell: thick rim
• Content: well-developed miracidium
Egg
• Testes: lobate, arranged obliquely
• O. viverrini: closer to each other and more deeply lobulated
Adult Worm
coser to each other and more deeply lobulated
O. viverrini
Opistorchis viverrini
o Symptoms: flatulence, fatigue,
dyspepsia, pain in the upper right quadrant of the abdomen, anorexia, and mild hepatomegaly
Light infection
Opistorchis viverrini
o Symptoms: obstructive jaundice, cirrhosis, cholangitis, and acalculous cholecystitis or bile peritonitis
Severe infection
Opistorchis felineus
o Symptoms: fever and hepatitis-like symptoms
Acute phase
Opistorchis felineus
o Symptoms: biliary tract obstruction, inflammation, fibrosis, liver abscess formation, pancreatitis, and suppurative cholangitis
Chronic phase
most serious complication for O. viverrini
Cholangiocarcinoma
