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Light micrograph of the larval stage of the parasitic nematode Trichinella spiralis. This nematode occasionally infects humans through the consumption of inadequately cooked domestic or wild pig meat. The adults live in the intestines for a period of 6-8 weeks during which time the females produce large quantities of larvae (not eggs). The larvae are not excreted in feces, but migrate through the intestinal walls to be carried to other tissue via the blood stream. They encyst between cells in voluntary muscle, causing pain and stiffness and provoke the host cells to produce oval outer cysts as seen here. Magnification: x64 at 35mm size.
