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Citation: Sheorey H, Biggs B, Ryan N. .
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Image of FIGURE 1

Relative sizes of helminth eggs. doi:10.1128/9781555817381.ch143.f1

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Image of FIGURE 2

Various eggs and adult worms of intestinal nematodes (magnification, ×850). (A) Fertile egg of . (B) Decorticated fertile egg of . (C) Infertile egg of . (D) adult worm with typical cylindrical body with tapering ends and thick cuticle. The adult worm is the largest of the human pathogenic nematodes, 15 to 35 cm in length. (E) Embryonated infective egg of . (F) Adult worms in feces (arrow). (G) adult female. Adult females are usually 8 to 13 by 0.3 to 0.5 mm. Shown is the anterior end of a female worm with the characteristic cervical alae. Typical eggs can also usually be seen in the field. (H) Egg of . doi:10.1128/9781555817381.ch143.f2

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Image of FIGURE 3

Eggs and larvae of intestinal nematodes (magnification, ×850). (A) Hookworm egg. (B) egg. (C) Rhabditiform, or first-stage, larva of . (D) Anterior end of rhabditiform larva of showing short buccal cavity. (E) Anterior end of rhabditiform hookworm larva showing long buccal cavity. (F) Tail end of filariform, or last-stage, larva of with the notched tail (arrow). (G) Tail end of filariform, or last-stage, hookworm larva with tapering tail. (H) Agar plate culture showing tracks of bacterial colonies due to larval movement on the surface and inside the agar. The fecal specimen is placed in middle of the plate and sealed, as larvae are infectious. doi:10.1128/9781555817381.ch143.f3

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Image of FIGURE 4

Sections of adult female worms taken at colonoscopy (hematoxylin-eosin stain). (A) female (×400) showing characteristic eggs (arrow); (B) female (×100) showing characteristic eggs (inset, ×400). doi:10.1128/9781555817381.ch143.f4

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Usual times for completion of nematode life cycles under favorable conditions

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Summary of common nematodes


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