Case of the Week 559
We're one week late due to my crazy travel schedule, but without further delay, here is our monthly case by Idzi Potters and theInstitute of Tropical Medicine, Antwerp. It's short and sweet: The following was found in a stool specimen from a 3 year old child with diarrhea. It measures approximately 80 micrometers in diameter. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - September 10, 2019 Category: Parasitology Source Type: blogs

Answer to Case 559
Answer toParasite Case of the Week 559:Hymenolepis diminutaThis was another great case by Idzi Potters. This egg had all of the characteristic features ofH. diminuta: large size (80 microns), and lack of polar filaments between the striated outer membrane and the smooth inner membrane.You can also nicely see some of the hooks of the internal 6-hooked oncosphere:Here is a side-by-side comparison ofH. diminutaeggs,and the eggs of the related cestode,Hymenolepis nana. You can see that they are very similar appearing, butH. nanaeggs are smaller and have polar filaments that originate from the inner membrane and extend out into...
Source: Creepy Dreadful Wonderful Parasites - September 8, 2019 Category: Parasitology Source Type: blogs

Case of the Week 558
This week's case presents a bit of a conundrum. The patient is a 50 year old woman with recent travel to Kenya. She presents with acute onset of fever and chills and was tested by a rapid malaria antigen test (P. falciparumand Pan-malaria antigens) and was negative. A follow-up Giemsa-stained thin blood smear from the same blood collection shows the following:Identification based on the blood smear? How might this correlate with the rapid antigen test? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - August 28, 2019 Category: Parasitology Source Type: blogs

Answer to Case 558
Answer toParasite Case of the Week 558:Plasmodium falciparummalaria,>10% parasitemia. NEGATIVE rapid antigen.Sowhy is the rapid antigen test negative???As noted by our readers, there are many possible reasons for apositive blood smear and negative rapid malaria antigen test (RDT). Here are our options, along with the reasons why each is or isn't a likely explanation in this case:This is babesiosis, and not malaria. This is a very important consideration given the morphologic similarities betweenBabesiaspp. andPlasmodium falciparum.However, the moprhologic features in this case are highly consistent withP. falciparu...
Source: Creepy Dreadful Wonderful Parasites - August 25, 2019 Category: Parasitology Source Type: blogs

Case of the Week 557
This week's case was donated by Florida Fan and one of his coworkers who found this beauty in some fresh salmon:Posterior end: Anterior end:Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - August 18, 2019 Category: Parasitology Source Type: blogs

Answer to Case 557
Answer toParasite Case of the Week 557: As mentioned by Bernardino Rocha, this is either an L3 larva of the Anisakidae or Raphidascarididae - 2 families of nematodes that are commonly found in fish. I tend to agree with Blaine and Bernardino that this is most likely a Type IAnisakis orPseudoterranovasp.; however, we would need to see its internal features to be sure (you can read the comments to learn how to clear the worm to visualize its internal structures). As Blaine mentioned, the presence of the mucron (the terminal spicule-like structure shown below) rules outContracaecumspp. and Type IIAnisakis.Other morphologic fe...
Source: Creepy Dreadful Wonderful Parasites - August 17, 2019 Category: Parasitology Source Type: blogs

Case of the Week 556
This week's case was donated by Dr. Neil Harris and Dr. Stacy Beal. The patient is an infant with a history of tracheobronchomalacia and " eosinophilia " on prior bronchoscopy. A routine complete blood count was negative without evidence of peripheral eosinophilia. The following structures were seen on a Giemsa-stained bronchoalveolar lavage specimen using the 100x objective. They have a diameter of 1-3 micrometers. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - August 13, 2019 Category: Parasitology Source Type: blogs

Answer to Case 556
Answer to theParasite Case of the Week 556: Curschmann spiralsCurshmann spirals can be a very pretty, but sometimes confounding parasite mimic in sputum, BAL and bronchial lavage specimens. They are spiral-shaped plugs of mucus from obstructed bronchioles, and are seen in patients with asthma and other conditions affecting the airways (e.g. tracheobronchomalacia as seen in this case). Although they can take on a roundworm-like appearance, they can be differentiated by their lack of defined morphologic features such as a cuticle and internal structures. Here is a striking photo from a different case (Papanicolaou stain): (S...
Source: Creepy Dreadful Wonderful Parasites - August 11, 2019 Category: Parasitology Source Type: blogs

Case of the Week 555 - a Special Challenge!
Dear readers,I am excited and humbled to be posting my 555th Parasite Case of the Week. I am continuously inspired by your comments, questions, and the rich discussion that occurs with each post. To mark this occasion, I'm asking you all to comment on ways that parasites relate to the number 5. I'll start you off with two that were previously suggested to me when I thought up this challenge:Pentatrichomonas hominisis a nonpathogenic intestinal flagellate named for its 5 flagella (penta from the Greek pente, meaning five + trich, pertaining to hair [flagella]). By Dr. Neil AndersonThere are 5 lobes of the human lung, and al...
Source: Creepy Dreadful Wonderful Parasites - August 2, 2019 Category: Parasitology Source Type: blogs

Answer to Case 555 - Parasites and the Number Five
Wow - we received so many excellent comments on how parasites and the number 5 go together! Here are many of them - in no particular order - for your viewing pleasure:Pentatrichomonas hominis is a nonpathogenic intestinal flagellate named for its 5 flagella (penta from the Greek pente, meaning five + trich, pertaining to hair [flagella]). By Neil Anderson and Bernardino Rocha.There are 5 lobes of the lung, and all can be infected by Paragonimusspecies. By Brian Duresko.The are 5Plasmodiumspecies that are responsible for the bulk of malaria in humans:P. falciparum, P. vivax, P. ovale, P. malariae, andP. knowlesi(t...
Source: Creepy Dreadful Wonderful Parasites - August 1, 2019 Category: Parasitology Source Type: blogs

Case of the Week 554
This week's case was generously donated by Florida Fan. The following are seen on Giemsa-stained thick and thin blood films. No history is immediately available. Diagnosis? Any additional information you would like? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 30, 2019 Category: Parasitology Source Type: blogs

Answer to Case 554
Answer to Parasite Case of the Week 554:Babesiaspecies. Without a travel history, the differential diagnosis includesPlasmodium falciparummalaria given that only ring forms are seen and there is a high parasitemia; however, the following features are supportive of babesiosis:1. Multiple (4) small forms within a single cell that are not a clear schizont form ofPlasmodium.2. Easily-identified extracellular forms.3. Lack of malaria pigmentAs Blaine mentioned, the rings are not thin and delicate as would normally be seen withP. falciparuminfection. While thicker rings are commonly seen in'older'blood (i.e., blood that was>2...
Source: Creepy Dreadful Wonderful Parasites - July 29, 2019 Category: Parasitology Source Type: blogs

Case of the Week 553
This week's (interesting but somewhat disturbing) case was generously donated by Dr. Jos é A. T. Poloni. The following was submitted from a fresh (unfixed) stool specimen. Most likely identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 23, 2019 Category: Parasitology Source Type: blogs

Answer to Case 553
Answer toParasite Case of the Week 553:Ascaris lumbricoidesThe overall appearance and large size of this nematode are strongly suggestive ofA. lumbricoides, given that this is a human stool specimen. As Sam mentioned, examining the anterior end for the characteristic 3 fleshy lips common to all ascarids, and examination of the stool for eggs would allow for confirmation of the identification.Here are some images from other cases to show these characteristic features:Adult with 3 fleshy lips fromCase of the Week 479:Mammillated and decorticated eggs fromCase of the Week 550Thanks to all that wrote in with the answer, and to...
Source: Creepy Dreadful Wonderful Parasites - July 21, 2019 Category: Parasitology Source Type: blogs

Answer to Case 554
Answer toParasite Case of the Week 554:Ascaris lumbricoidesThe overall appearance and large size of this nematode are strongly suggestive ofA. lumbricoides, given that this is a human stool specimen. As Sam mentioned, examining the anterior end for the characteristic 3 fleshy lips common to all ascarids, and examination of the stool for eggs would allow for confirmation of the identification.Here are some images from other cases to show these characteristic features:Adult with 3 fleshy lips fromCase of the Week 479:Mammillated and decorticated eggs fromCase of the Week 550Thanks to all that wrote in with the answer, and to...
Source: Creepy Dreadful Wonderful Parasites - July 21, 2019 Category: Parasitology Source Type: blogs

Case of the Week 552
This week's case is from Blaine Mathison. The following were seen on a trichrome-stained stool specimen. They averaged 5 to 7 micrometers in greatest dimension. A Giardia antigen test was positive.Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 15, 2019 Category: Parasitology Source Type: blogs

Answer to Case 552
Answer to Parasite Case of the Week 552:Enteromonas hominisThis was a tough one! Not a surprise since it came from Blaine 😊The organisms shown are small trophozoites, measuring only 5 to 7 micrometers in greatest dimension, and no cysts were seen, thus making identification a bit challenging. While I think that some of these trophozoites look a bit likeChilomastix mesnili(for example, some of the larger forms in the first image), I think that the smaller size, less elongated shape without a well-defined terminal point, and larger karyosome is more consistent withE. hominis. The CDC doesn't have any good trophozoite...
Source: Creepy Dreadful Wonderful Parasites - July 14, 2019 Category: Parasitology Source Type: blogs

Case of the Week 551
This week's case was generously donated by Florida Fan and is very appropriate for this time of the year!The following objects were seen on a stool specimen that had been stained by Wright-Giemsa to look for fecal leukocytes (total magnification 1000x). Preliminary identification? What additional stain would you like to perform to confirm your diagnosis? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 9, 2019 Category: Parasitology Source Type: blogs

Answer to Case 551
Answer toParasite Case of the Week 551:Cyclospora cayetanensisoocysts.This is an unusual preparation in that we don't usually seeC. cayetanensisoocysts in Giemsa-stained preparations. Therefore, confirmation using a conventional stain such as modified acid fast or modified safranin would be indicated. The diagnosis can be made by the shape and size (~8 micrometers) in diameter.Thanks again to Florida Fan for sharing this interesting case! (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 7, 2019 Category: Parasitology Source Type: blogs

Case of the Week 550
Happy July everyone! Here is our first case of the month by Idzi Potters and theInstitute of Tropical Medicine, Antwerp. The following objects were seen in a concentrated wet prep of a stool specimen from an international adoptee from Ethiopia. They measure approximately 60 micrometers in greatest dimension. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - July 1, 2019 Category: Parasitology Source Type: blogs

Answer to Case 550
Answer toParasite Case of the Week 550:Ascaris lumbricoideseggs, decorticatedKudos to everyone who took the time to write in with their answer. All responses were correct! And I really enjoyed hearing about the different layers of of nematode eggs from Old One and Blaine. Here is some of the information they shared in their comments, along with some definitions:Decorticated - To remove the bark, rind, or husk from; i.e., to remove the outer mammillated layerMammillated - Having relatively small protrusions from the exterior, most commonly the surfaceThis case happened to have both mammillated and decorticated eggs, wi...
Source: Creepy Dreadful Wonderful Parasites - June 30, 2019 Category: Parasitology Source Type: blogs

Case of the Week 549
This week's rather creepy and very cool case was donated by Dr. Matt Bolek and Christina Anaya. While the host shown here is not a human, this parasite emerging from the cricket is occasionally submitted to human clinical parasitology laboratories. What is its significance for human health? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - June 18, 2019 Category: Parasitology Source Type: blogs

Answer to Case 549
Answer to Parasite Case of the Week 549: " Gordian " or " horsehair " worms, belonging to the group Nematomorpha. I had asked what its significance is for human health; this was a trick question, since gordian worms have no direct clinical significance, other than scaring people when they are found in toilet water! When submitted to the clinical parasitology laboratory, they can easily be differentiated from other large worms such asAscaris lumbricoides by their long slender bodies:I have to admit that I was amazed by how many worms emerged from the poor cricket in this fascinating video donated by...
Source: Creepy Dreadful Wonderful Parasites - June 17, 2019 Category: Parasitology Source Type: blogs

Case of the Week 548
This week's case was generously donated by Dr. Tara Ness, with filming credit to the Lab Hlathi Team in eSwatini. The following arthropod was found in the urine specimen of a man with HIV and a history of dysuria. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - June 10, 2019 Category: Parasitology Source Type: blogs

Answer to Case 548
Answer: Mite, most likelyDermatophagoidesspecies (dust mite).As mentioned by several readers, we are lacking sufficient details to make a definitive identification. However, we can conclude that this is a contaminant in this specimen and not a cause of the patient's symptoms. As Blaine mentioned, this is a " Conta-mite-nt " !Some readers mentioned thatSarcoptes scabeishould be considered. While this is also a mite, its distinctive features, including its short legs and overall body shape, allow for differentiation fromDermatophagoides:Thanks again to Dr. Ness and her lab for donating this case. (Source: Creepy Dr...
Source: Creepy Dreadful Wonderful Parasites - June 9, 2019 Category: Parasitology Source Type: blogs

Case of the Week 547
Here is our monthly case by Idzi Potters and theInstitute of Tropical Medicine, Antwerp.The following 1-cm long structure was extracted from a Belgian patient returning from Ghana. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - June 3, 2019 Category: Parasitology Source Type: blogs

Answer to Case 547
Answer toParasite Case of the Week 547:Cordylobia rodhaini, also known as Lund's fly.As noted by Bernardino, this is a 3rd instar larva, with a characteristic shape, size, irregularly-placed, weakly-pigmented cuticular spines and spiracles for this species. The more sinuous spiracles allows us to differentiate this fromCordylobia anthropophaga,the " tumbu fly " which is more commonly seen on humans. Both are found in the African subtropics.From Old One:Hooray for Bernardino a wiz at diagnosticsLund ’s fly no match for his skillful forensicsThe folks on the blog all think he is swellNever missing his mark, t...
Source: Creepy Dreadful Wonderful Parasites - June 2, 2019 Category: Parasitology Source Type: blogs

Case of the Week 546
This week's case has been generously donated by Blaine Mathison at ARUP. Two different types of objects were seen in a trichrome-stained stool specimen that was screened by a digital slide image and machine learning platform. How did it do? Did it find real parasites?The following objects are approximately 8 to 13 micrometers in diameter:These objects are 10 to 15 micrometers in greatest dimension.Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - May 28, 2019 Category: Parasitology Source Type: blogs

Answer to Case 546
Answer:Blastocystissp. andEntamoebasp.From Blaine: These images were captured by software trained to detect intestinal protozoa in trichrome-stained stool specimens. The final report wasEntamoeba histolytica/E. dispar andBlastocystissp. It is difficult to determine the species ofEntamoebafrom only four examplars, but the even peripheral chromatin and discrete karyosome are supportive ofE. histolytica/E. disparwhich is how this case was signed out from both the slides and the whole-slide scanned image. I see a lot of respondents placing weight on the cytoplasm, which I always take as a ‘soft’ feature &ndash...
Source: Creepy Dreadful Wonderful Parasites - May 26, 2019 Category: Parasitology Source Type: blogs

Case of the Week 545
This week's case was donated by Dr. David Pritchard. The following worm was noted in the toilet of a patient with an extensive international travel history. Likely identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - May 20, 2019 Category: Parasitology Source Type: blogs

Answer to Case 545
Answer: Not a human parasite: earthworm (Phylum Annelida, subclass Oligochaeta). It could very well be aLumbricusspecies as some readers suggested, but I don't know enough about the different genera of earthworms to tell you for sure. Perhaps a knowledgeable reader can educate us on this topic?So, wow, I've been on a roll with these parasite mimics! I'll try my best to include some true parasites in upcoming posts. Those of you who have followed this blog for a while probably know that I am fond of mimics - probably because they are so commonly seen in the clinical microbiology lab and provide an interesting challenge...
Source: Creepy Dreadful Wonderful Parasites - May 19, 2019 Category: Parasitology Source Type: blogs

Case of the Week 544
This week's case features an interesting finding in a concentrated stool specimen. The photos are from my awesome technical specialist, Heather Arguello. The individual structures are approximately 25  micrometers in length, while the longer tubular structure is 330 micrometers long.Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - May 13, 2019 Category: Parasitology Source Type: blogs

Answer to Case 544
Answer to Parasite Case of the Week 544: Ascus with ascospores (presumed mushroom) spores. Interestingly, it is morel season in many parts of the United States, and these appear to be aperfect matchto morel ascospores!While we commonly see mushroom spores in stool specimens (and have to differentiate them from  helminth eggs), and intact ascus (a sac in which the spores of ascomycete fungi develop) is rarely seen. Thanks again to my lead tech Heather who took the time to snap a photo of this cool finding! (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - May 13, 2019 Category: Parasitology Source Type: blogs

Case of the Week 543
This week we are featuring our monthly case from Idzi Potters and theInstitute of Tropical Medicine, Antwerp.The patient is a 15 year old boy returning from swimming camp, who presents with several-day history of profuse watery diarrhea. A stool specimen was submitted for parasite examination, and multiple small (3-6 µm), round structures were identified. The following photos are taken after:1. Negative fuchsine staining according to Heine (brightfield microscopy)2. Negative fuchsine staining according to Heine (phase-contrast microscopy)3. Ziehl-Neelsen staining ( “cold” modified technique)Identificat...
Source: Creepy Dreadful Wonderful Parasites - May 6, 2019 Category: Parasitology Source Type: blogs

Answer to Case 543
Answer toParasite Case of the Week 543:Cryptosporidiumsp. oocystsThe case shows howCryptosporidiumoocysts look in a variety of different preparations including phase contrast (very cool). As we are all taught during training,Cryptosporidiumspp. oocysts are red-pink using a modified acid fast stain (as shown in image 3 of this case) and measure 4-6 micrometers in diameter, thus allowing their differentiation from the similarly-appearingCyclospora cayetanensisoocysts (which are 8-10 micrometers in diameter). Florida Fan reminded us that not all of the oocysts will reliably stain with the modified acid fast stain, and thus so...
Source: Creepy Dreadful Wonderful Parasites - May 5, 2019 Category: Parasitology Source Type: blogs

Parasite Case of the Week 542
This week's case is a lovely gif image compiled by our excellent parasitology technical specialist, Heather Arguello. The following structures were seen on a non-nutrient agar culture that had been inoculated with corneal scrapings. The plate had been overlain withEscherichia colito provide a food source for parasites that may be present in the specimen. The central structure is ~40 micrometers in maximum dimension, while the rounded structure to the left is ~15 micrometers in diameter. Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 29, 2019 Category: Parasitology Source Type: blogs

Answer to Case 542
Answer toParasite Case of the Week 542:Acanthamoebasp. trophozoite and cystsThe free-living amebae, Acanthamoebaspecies and Naegleria fowleri(but notBalamuthia mandrillaris) can be grown on non-nutrient agar overlain with bacteria to provide a food source for the organisms. In this case, the presence of a characteristic double-walled cyst and trophozoite, along with the source (corneal scrapings) allow us to identify this ameba as anAcanthamoebaspecies.We sadly did away with our free-living amebae culture a while back and replaced it with a multiplex real-time PCR assay. It's faster than culture, while providing ...
Source: Creepy Dreadful Wonderful Parasites - April 29, 2019 Category: Parasitology Source Type: blogs

Case of the Week 541
This week's case was generously donated by Drs. Mauro Saio and David Hamer. The patient is a middle-aged male who noted the following objects in his stool. Individually, they measured approximately 1 cm in length. Identification?  (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 23, 2019 Category: Parasitology Source Type: blogs

Answer to Case 541
Answer to Parasite Case of the Week 541: not a parasite; citrus juice vesicles.This is a not-uncommon finding in stool that is helpful to recognize, since it is occasionally submitted as a potential parasite. In this case, the patient reported eating clementines regularly. So here is a dissection of a clementine for comparison:Pretty good, huh? Of course it's not possible to recognize the type of citrus from this case alone, and a report of " not a human parasite " is usually sufficient for patient care.Wikipedia has anice articleon juice vesicles if you would like more information. (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 21, 2019 Category: Parasitology Source Type: blogs

Case of the Week 540
This week's beautiful photographs are from Emily Fernholz at my lab. These objects were seen in stool and measure approximately 80 micrometers in length. Identification?The features are nicely appreciated on this video: (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 16, 2019 Category: Parasitology Source Type: blogs

Answer to Case of the Week 540
Answer toParasite Case of the Week 540:Macracanthorhynchusspecies, one of the acanthocephala ( " thorny-headed worms " ). M. hirudinaceusorM. ingenswould be the most likely culprits, although as mentioned by Florida Fan, we would need the head of the worm to morphologically identify this to the species level. The acanthocephala are common parasites of animals, but only rarely infect humans. Infection is acquired through ingestion of an infected arthropod such as a millipede or beetle.The eggs are very striking. They are ovoid and measure 80-100 micrometers in length. As described by Bernardino Rocha, they ar...
Source: Creepy Dreadful Wonderful Parasites - April 14, 2019 Category: Parasitology Source Type: blogs

Case of the Week 539
This week's beautiful case was donated by Florida Fan - a finding in a concentrated stool specimen:The scale bars each represent 2.5 micrometers.Identification? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 8, 2019 Category: Parasitology Source Type: blogs

Answer to Case 539
Answer to Parasite Case of the Week 539:Hymenolepis nanaThis beautiful egg donated by Florida Fan nicely demonstrates all of the classic features ofH. nana,including the thin inner membrane surrounding the hooked oncosphere [*] from which polar filaments arise. The polar filaments arise from opposite poles of the inner membrane (arrows) and spread out into the space between the inner and outer membranes, thus providing a key differentiating feature from the filamentless-Hymenolepis diminuta.Blaine wrote a poem for this parasite back when I featured it in 2013. Here it is again for your enjoyment:There once was a kid from I...
Source: Creepy Dreadful Wonderful Parasites - April 8, 2019 Category: Parasitology Source Type: blogs

Case of the Week 538
Here is our fun monthly case from Idzi Potters and theInstitute of Tropical Medicine, Antwerp:Your boss brings in some wormy things and mentions that “his cat regurgitated these in the morning”.What is your diagnosis? Risk for humans? (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - April 1, 2019 Category: Parasitology Source Type: blogs

Answer to Case 538
Answer:ToxocaraspeciesAnother case with lots of great discussion! There was quite a bit of debate on whether or not this wasT. cativs.T. leonina.This differentiation is potentially important since the former is commonly associated with human larva migrans (visceral, ocular and neural), whereas the latter only rarely is. As noted by Old One, a number of morphologic characteristics can be used to differentiate between the two, including the worm size, male spicule morphology, egg morphology and shape of the cervical alae. The cervical alae are short and wide inT. cati,and long and narrow inT. leonina.As the cervical alae in ...
Source: Creepy Dreadful Wonderful Parasites - April 1, 2019 Category: Parasitology Source Type: blogs

Google+ is going away - email me to get new post updates!
To my 594 Google+ followers,Thank you for following me for all these years! You may have heard that Google+ is going away, and therefore you will no longer be notified when there are new posts on my blog. Therefore, if you still want to receive notifications (I don't want to lose you as a reader!), please email me at b_pritt@yahoo.com and I will add you to my email distribution list. Alternatively, you can follow me on Twitter (@ParasiteGal) or on my FaceBook page, Creepy Dreadful Wonderful Parasites. I also post new cases weekly to LinkedIn. (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - March 26, 2019 Category: Parasitology Source Type: blogs

Case of the Week 537
This week's case comes from my lab with photos and video taken by Emily Fernholz. The objects shown were seen in a liver cyst aspirate. Identification?Low power view (4x objective):40x objective:Here's a fun'bird's eye'view (hit the play button twice): (Source: Creepy Dreadful Wonderful Parasites)
Source: Creepy Dreadful Wonderful Parasites - March 25, 2019 Category: Parasitology Source Type: blogs

Answer to Case 537
Answer toCase of the Week 537:EchinococcusspeciesShown here are the classic protoscoleces ofEchinococcus,each with a rostellum containing a row of hooklets (i.e. an'armed'rostellum). The rostellum is the anterior protrusion found on some tapeworms.As Old One mentioned, " There are 4 species ofEchinococcusthat infect humans:E. granulosus, E. multilocularis, E. vogeli, and E. oligarthus. Without more information such as host location, medical imaging, measurement of rostellar hooklets, one cannot be certain of the species. However one can make an educated guess.E. multiloculariscysts are [usually] sterile (no protoscole...
Source: Creepy Dreadful Wonderful Parasites - March 23, 2019 Category: Parasitology Source Type: blogs

Case of the Week 536
I have a fun case for you this week, donated by Dr. Richard Davis, Blaine A. Mathison, and Dr. Marc R. Couturier from ARUP Laboratories and the University of Utah School of Medicine.The following objects were found in stool of a toddler living in the Oceania region. There were motile and described as " rice like " .Manipulation of the object and microscopic examination of the expressed material revealed the following structures measuring approximately 200 µm in diameter with a dark center. Within the dark area were numerous smaller objects measuring 25-35 µm in diameter:Identification? (Source: Creepy...
Source: Creepy Dreadful Wonderful Parasites - March 18, 2019 Category: Parasitology Source Type: blogs