Hookworm
A. B.
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Hookworm eggs examined on wet mount (eggs of Ancylostoma duodenale and
Necator americanus cannot be distinguished morphologically). Diagnostic
characteristics: Size 57-76 µm by 35-47 µm. Oval or ellipsoidal shape. Thin
shell. The embryo in B has begun cellular division and is at an early (gastrula)
developmental stage.