Case of the Week 61
The following pieces of tissue (labeled “skin”) were received in the laboratory from an 80 year old man. No further history was available. On closer examination, they appeared to be friable ‘scabs’:
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Answer to Case of the Week 60
Answer: Copepods are involved in the following parasite life cycles: 1. Diphyllobothrium latum, the broad fish tapeworm 2. Dracunculus medinensis, the Guinea worm 3. Spirometra spp., the cause of sparganosis in humans 4. the agents of gnathostomiasis: Gnathostoma spinigerum and Gnathostoma hispidum
Case of the Week 60
The following objects are Cyclops–one of the most common genera of microscopic fresh water Copepods (small crustaceans) that are involved in a number of parasite life cycles. So the question for this week: Which human parasites have Copepods in their life cycle?
Answer to Case of the Week 59
Answer, Part I: Trichinella spp. Although Trichinella spiralis is the most common species to infect humans in the United States, it is generally not possible to speciate based on morphologic features. The exception is Trichinella pseudospiralis whose larvae are not encapsulated compared to T. spiralis, T. nativa, T. nelsoni, T. britovi, and T. murrelli which [...]
Case of the Week 59
The following were an incidental finding at autopsy. Shown are hematoxylin and eosin stained sections of human tongue:
Answer to Case of the Week 58
Answer: Leishmania spp. amastigotes. Note the small (2-5 micron) oval-shaped objects within and outside of macrophages, with a nucleus and classic rod-shaped kinetoplast. The large purple objects are macrophage nuclei.
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