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[Ancylostoma braziliense] [Ancylostoma caninum] [Ancylostoma duodenale] [Necator americanus]

Rhabditiform (L1) larvae that hatch from eggs are 250-300 µm long and approximately 15-20 µm wide.  They have a long buccal canal and an inconspicuous genital primordium.  Rhabditiform larvae are usually not found in stool, but may be found there is a delay in processing the stool specimen.  If larvae are seen in stool, they must be differentiated from the L1 larvae of Stronyloides stercoralis.

A	B

A, B: Hookworm rhabditiform larva (wet preparation).