As a bonus, what is the structure seen inside the egg below?
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Welcome to Parasite Case of the Week
Every week I will post a new Case, along with the answer to the previous case. Please feel free to write in with your answers, comments, and questions. Also check out my image archive website at http://parasitewonders.com. Enjoy!
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Please note that all opinions expressed here are mine and not my employer. Information provided is for educational purposes only. It is not intended as and does not substitute for medical advice. I do not accept medical consults from patients.
The Fine Print:
Please note that all opinions expressed here are mine and not my employer. Information provided is for educational purposes only. It is not intended as and does not substitute for medical advice. I do not accept medical consults from patients.
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9 comments:
This is a large operculated egg, from the given size the morphology is compatible with Fasciola hepatica or Fasciolopsis buski. The internal stage is a miracidium.
Florida fan
Agree with florida tan
Agree with florida tan
Agree with Fasciola/Fasciolopsis - no knob or shouldered operculum - broadly oval. Love the flukes - and love the look on my students faces when I show them what a water caltrop nut looks like.
What about Diphyllobothrium latum or D. pacificum? The internal structure looks like it has a scolex, it may be a plerocercoid larvae.
Presentation and morphology is consistent with Fasciola hepatica or Fasciolopsis buski. The Eggs are large and operculate, the size would discount diphyllobothrium which, although similar in morphology, are smaller (between about 55 - 75uM). The first egg appears to be unembryonated, the second is hatched and in the third you can clearly see a (rather small) miracidium waiting to hatch. It is sometimes worth looking for flame cells in the miracidium while it is unhatched (they are highly motile once hatched) to establish whether they are still alive, though this is largely just for scientific interest! We culture F.hepatica at our lab and maintain a fair few strains for research purposes.
I stand corrected! They are too large for Diphyllobothrium sp. (overlooked the 100um size guide). Most Fasciola hepatica eggs I've seen are slightly more elongated than the ones shown here, so my guess would be Fasciolopsis buski.
fasciola spp. eggs
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