Schistosoma haematobium vs Schistosoma mansoni and japonicum
How to tell Schistosoma haematobium and Schistosoma mansoni and japonicum apart when a board question makes them look alike.
Haematobium is urinary hematuria and bladder cancer; mansoni and japonicum are intestinal liver-portal disease.
Side by side
S. haematobium causes urinary schistosomiasis with terminal hematuria, bladder wall inflammation, obstructive uropathy, and squamous cell carcinoma of the bladder.
S. mansoni and S. japonicum cause intestinal and hepatosplenic disease with bloody diarrhea, portal hypertension, periportal fibrosis, and splenomegaly.
Freshwater cercariae penetrate skin and adult worms deposit eggs in venous plexuses around the bladder.
Freshwater cercariae mature and deposit eggs in mesenteric venules, driving granulomatous inflammation and portal fibrosis.
Eggs with terminal spines in urine, hematuria, bladder calcification, and freshwater exposure support S. haematobium.
Eggs with lateral spines for mansoni or small lateral knobs for japonicum in stool support intestinal hepatosplenic schistosomiasis.
The trap
All schistosomes come from freshwater skin penetration, so egg location and organ damage separate them.
The repair move
For Schistosoma, find the egg in urine or stool before naming the species pattern.
Try a free question
CoreA 32-year-old man from rural Egypt has months of painless terminal hematuria and urinary frequency. CT shows a calcified, thickened bladder wall, and microscopy of urine reveals ova with a prominent spine at one pole. Which parasite is most likely responsible?
Show answer and explanation
Answer: A. Schistosoma haematobium. Schistosoma haematobium localizes to the vesical venous plexus and its eggs drive chronic bladder inflammation, hematuria, and squamous carcinoma risk.
Why the other choices are tempting
- B. Schistosoma mansoni produces intestinal and portal disease, with eggs detected in stool rather than urine.
- C. Schistosoma japonicum also causes intestinal and hepatosplenic schistosomiasis, not calcified bladder disease with urinary eggs.
- D. Clonorchis sinensis infects the biliary tree after ingestion of freshwater fish and is associated with cholangiocarcinoma.
- E. Strongyloides stercoralis can autoinfect and cause hyperinfection in immunosuppressed hosts, but it does not cause terminal hematuria with bladder calcification.
Flashcards
Tap a card to flip it.
Which Schistosoma species is linked to bladder cancer?
Schistosoma haematobium is linked to squamous cell carcinoma of the bladder.
What egg spine supports S. haematobium?
A terminal spine on eggs in urine supports S. haematobium.
Quick answers
What is the fastest way to tell Schistosoma haematobium from Schistosoma mansoni and japonicum?
Haematobium is urinary hematuria and bladder cancer; mansoni and japonicum are intestinal liver-portal disease.
What is the key clue for Schistosoma haematobium?
S. haematobium causes urinary schistosomiasis with terminal hematuria, bladder wall inflammation, obstructive uropathy, and squamous cell carcinoma of the bladder.
What is the key clue for Schistosoma mansoni and japonicum?
S. mansoni and S. japonicum cause intestinal and hepatosplenic disease with bloody diarrhea, portal hypertension, periportal fibrosis, and splenomegaly.
What is the common trap with Schistosoma haematobium vs Schistosoma mansoni and japonicum?
All schistosomes come from freshwater skin penetration, so egg location and organ damage separate them.