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Slide 1 is a photo of a guinea pig infected with Balisascaris procyonis, the raccoon roundworm. In hosts other than the raccoon (including man), larvae tend to migrate in nervous tissues and can cause severe dlinica signs. Note how this guinea pig is overextending its neck (opisthotonos). |
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Slide 2 is a photo of a Balisascaris larva removed from the brain of an infected guinea pig by the Baermann technique. |
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Slide 3 is a photo of a fecal flotation preparation from a raccoon infected with Balisascaris procyonis. |
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Slide 4 is a photo of a histologic section of brain from a guinea pig infected with Balisascaris procyonis. Note cross sections of worm larvae. |
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Slide 5 is a photo of a histologic section of sekeletal muscle from a rat experimentally infected with Trichinella spiralis. This worm is transmitted to several hosts, including man ,by eating poorly cooked meat containing larvae. Infection is usually asymptomatic. |
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Slide 6 is a photo of a histologic section of nonglandular stomach from a rat infected with Gongylonema neoplasticum. Note cross section of worm within the mucosal epithelium. this worm is transmitted via intermediate hosts (i.e. cockroaches); larvae develope in the tongue and stomach and can cause proliferative lesions (hence the name) or gastric ulcers. |
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Slide 7 is a photo of a histologic section of lung from a rat infected with Angiostrongylus cantonensis. This worm is transmitted by an intermediate host (mollusks) and can cause severe respiratory disease. |
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Slide 8 is a photo of a histologic section of liver from a rat infected with Capillaria hepatica. Note the cross sections of worms filled with and surrounded by eggs with bipolar plugs. Transmission ocurs via ingestion of infected livers. Clinical disease is uncommon except in heavy parasite loads. |
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Slide 10 is a photo of an adult Cittotaenia sp., a tapeworm of rabbit (rabbits are the definitive host). These tapeworms are transmitted by an intermediate host (orbatid mites), inhabit the small intestine and generally cause no clinical signs. Diagnosis is based on size of worm (450 x 10.5 mm) and the presence of an unarmed scolex. Rabbits can also be infected with the tapeworm, Raillietina sp.; these tapeworms are transmitted by ants, are smaller (86 x 3 mm) and have an armed rostellum. |
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Slide 11 is a photo of the unarmed scolex of Cittotaenia sp. |
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Slide 12 is a photo of a flea from a rabbit. |
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Slide 13 is a photo of a cottontail rabbit with a nodule on its shoulder. |
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Slide 14 is a photo of the nodule showing a pore opening to the surface. |
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Slide 15 is a photo of the larvae of Cuterebra sp., a botfly. This larva was removed from the nodule shown in photos 10 and 11. |
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Slide 16 is a photo of Hopopleura hirsuta, a sucking louse of rats. Note the typical features of suckling lice. |
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Slide 17 is a photo of a mite found while tape testing a mouse. This mite was not speciated but probably represents a bedding or grain mite (mites that feed on fungi or other microorganisms, live in grain or bedding and do not require a vertebrate host). |
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Slide 18 is a photo of a Sarcoptes sp. female mite from a hedgehog with dermatitis. |
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Slide 19 is a photo of a Sarcoptes sp. male mite from a hedgehog with dermatitis. |
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Slide 20 is a photo of a histologic section of skin from a hedgehog infected with Sarcoptes sp. Note the abundant eosinophilic (pink) derbris over the skin. (This represents a scab grossly) and cross sections of mites beneath this scab. |
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Slide 21 is a photo of a histologic section of skeletal muscle infected with Toxoplasma sp. |
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Slide 22 is a photo of a blood smear from a hamster infected with Leishmania sp. |
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Slide 23 is a photo of a blood smear from a mouse infected with Trypanosoma sp. |
