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84 Cards in this Set

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Microfilaria.
In stained peripheral blood smears the microfilariae can be most easily seen in the tail of the film when the film is examined with a low power objective.
Microfilaria.
Microfilaria.
W. bancrofti.
There is a gap between the last of the nuclei within the organism and the tip of the tail.
Microfilaria.
Brugia malayi.
Characteristic arrangement of spaced nuclei in the tip of the tail in this species of microfilaria.
Microfilaria.
Brugia malayi.
Characteristic arrangement of spaced nuclei in the tip of the tail in this species of microfilaria.
Adult filarial worms.
Adult filarial worms.
Degenerating adult filarial worm.
Filaria.
Calcified dead worms.
Filaria.
Calcified dead worms.
Filaria.
Calcified dead worms.
Microfilaria in alveola.
Microfilaria.
Microfilaria in a capillary within a renal glomerulus.
Microfilaria.
Microfilaria in a capillary within a renal glomerulus.
Microfilaria in anterior chamber of eye.
Onchocerca.
Fibrotic nodule through which there are many adult Onchocerca worms cut in transverse section.
Onchocerca.
The morphology of these worms is similar to that of the Wuchereria bancrofti but the distinction is made because the adult worms are found in a subcutaneous nodule and not in a lymph node and the microfilariae are non-sheathed and are present in the dermis, not in the blood.
Dirofilariasis.
Lung.
Dirofilariasis.
Lung.
Trichinella.
Trichinella.
Trichinella.
Trichinella.
Encysted larvae of Trichinella spiralis can be seen.
Trichuris trichiura (whipworm).
The egg is brownish and looks like a barrel with corks at both ends.
Trichuris triciura (whipworm).
Adult female with a pointed tail. The distal part of the worm resembles the handle of a whip.
Trichuris trichiura.
Transverse section of an appendix. The appendix is not inflamed but transverse sections of a worm can be seen in the lumen. There are two components of the worm. A larger component in the middle of the lumen and two smaller components futher up and to the right. This corresponds to a transverse section through the distal and the proximal ends respectively of a Trichuris worm.
Trichuris trichiura.
High power view of the anterior end of the Trichuris worm. The single alimentary canal can be seen in the middle of the worm.
Trichuris trichiura.
Transverse section through the posterior end of the worm. This is a male worm. The transverse section of the intestine and the three lobes of testis can be identified.
Trichuris trichiura.
Transverse section from a female Trichuris worm. The alimentary canal and the uterus filled with eggs are visible.
Feces in the lumen of an appendix. Here there are Trichuris eggs (oval with terminal plugs) and Ascaris eggs (larger, with thick, irregular shells).
Trichuris trichiura.
Trichuris trichiura.
The thin head ends were embedded in the surface mucosa.
Hookworm.
An adult female. The head end is turned backwards at an acute angle, giving the appearance of a hook, which gives the worm its name. The tail is pointed.
Hookworm.
Shows the head end more clearly with the "teeth" by which the worm attaches itself to the mucosa.
Hookworm.
Male worm recognised by the appearance of the copulatory bursa at the tail end.
Hookworm.
Closer view of the copulatory bursa.
Hookworm.
An area of microscopic ulceration of the small intestinal mucosa caused by the attachment of the hookworm.
Hookworm.
Hookworm egg passed in the faeces. The eggs measure approximately 60 x 40 microns. They are oval. The cuticle is transparent; and the segmented, developing larva is seen within the egg.
Strongyloides.
Transverse sections of the female worm show the presence of an alimentary canal and bilobed uterus within the cuticle of the worm.
Strongyloides.
Longitudinal section of larvae in the base of an ulcer.
Strongyloides.
An adult female and a number of larva.
Strongyloides larva.
Cutaneous larva migrans.
Typical track-like rash of cutaneous larva migrans on the lower leg of a boy aged five years. The serpiginous track developed over a few days. It was intensely itchy.
Cutaneous larva migrans.
Closer view of one of the lesions on the boy's leg. The track is made by the movement of the larva through the upper dermis. It is usually not possible to find the larva in a skin biopsy because it is in the skin in advance of the obvious rash on the skin surface. All one sees is the reaction caused by its passage.
Angiostrngyliasis.
The hemorrhage and necrosis of the white matter is more clearly visible and a worm can be seen in this tissue. The cortical grey matter is oedematous and partially necrotic.
Angiostrongylodiasis.
Shows the complete necrosis of the white matter (encephalomalacea), and the worm noted macroscopically. There is edema and ischemia in the cerebral cortex.
Angiostrongylodiasis.
Thrombosed pulmonary artery.
Angiostrongylodiasis.
Thrombosed pulmonary artery.
Angiostrongylodiasis.
Transver view of worm.
Enterobius vermicularis.
Longitudinal section of an appendix. The lumen is filled with small worms.
Enterobius vermicularis.
Worms in the lumen of an appendix.
Enterobius vermicularis.
Female worms cut in transverse sections.
Enterobius vermicularis.
A female worm. The cuticle has two well-defined lateral alae or spikes. The eggs can be easily seen in the uterus.
Enterobius vermicularis.
Longitudinal section of a male worm in the lumen of the appendix. At the top one can see the mouth and the oesophagus which leads to a prominent oesophageal bulb. The alimentary canal traverses the remainder of the worm beside the reproductive tube which has a thin wall. In this photograph it has a black colour. The tail end of the worm is flat and it carries a single copulatory spicule.
Enterobius vermicularis.
Female worm removed from the appendix. It measured 10mm in length. The esophagus leads from the mouth to the prominent esophageal bulb. The remainder of the worm is composed of uterus filled with eggs.
Enterobius vermicularis egg.
They have a transparent capsule and they are flattened on one side.
Enterobius vermicularis.
Sometimes Enterobius eggs can be seen as incidental findings in Papanicolau smears from the cervix as shown here.
Ascaris lumbricoides.
Ascaris lumbricoides.
Male Ascaris worm. These worms vary in size from about 150 - 300mm. The male has a tightly coiled tail.
Ascaris lumbricoides.
Female Ascaris worm. The females have a pointed tail.
Ascaris lumbricoides.
The scan shows dilatation of intrahepatic bile ducts.
Ascaris lumbricoides.
Marked dilatation of the common bile duct and a linear filling defect within the duct.
Ascaris lumbricoides.
Ascaris lumbricoides.
Ascaris lumbricoides.
Schistosoma.
Cercaria form.
Schistosoma.
A Miracidium hatching from a S. haematobium egg in urine.
Schistosoma.
Actively motile, ciliated miracidium.
Schistosoma.
Actively motile, ciliated miracidium.
Schistosoma hematobium egg in urine. It has a terminal spine.
Schistosoma.
Low power view of a section which includes the serosal surface of the rectum. The muscle of the rectum can be seen on the right of the photograph. An adult male and female schistosome worm can be seen in the pararectal tissue. The male worm is wider than the female and it encloses thefemale in what is called its gynaecophoric canal. Eggs hatch and pass into the adjacent connective tissue. They produce irritation and a tissue response.
Schistosoma.
The female is enclosed in the gynaecophoric canal of the male.
Schistosoma.
Degenerated eggs in liver.
Schistosoma.
Degenerated eggs in liver.
Clonorchis sinensis.
The bile ducts of the liver are extensively plugged with liver flukes.
Clonorchis sinensis.
The bile ducts of the liver are extensively plugged with liver flukes.
Clonorchis sinensis.
They are each approximately 20mm in length. The internal structure is easily seen - oral sucker (A), esophagus which branches into two caeca that extend the whole length of the fluke (B), uterus (C), ovary (D), testes (E).
Clonorchis sinensis.
Stained Clonorchis fluke. This shows the head end with the oral sucker, esophagus and caeca more clearly.
Clonorchis sinensis.
Mid portion of the worm with the uterus (C), ovary (D) and testis (E).
Clonorchis sinensis.
Show the presence of flukes in the bile duct. There is marked thickening of the bile duct epithelium.
Clonorchis sinensis.
Liver.
Clonorchis sinensis eggs.
The eggs are oval, a brown color, relatively small (about 30 x 10 microns) and with an operculum at one end (seen here at the lower end).
Paragonimus westermanii.
The body wall of the fluke is clearly identified. The internal organs consist of alimentary canal and testis.
Paragonimus westermanii.
Brown, thick-shelled, birefringent eggs in the lung adjacent to the fluke.