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

Infective, third-stage (L3), filariform larvae are 500-600 µm long.  They have a pointed tail and a striated sheath.  These L3 are found in the environment and infect the human host by penetration of the skin.

Hookworm filariform larva Hookworm filariform larva
A B

A, B:  Filariform (L3) hookworm larvae.

Hookworm filariform larva Hookworm filariform larva, posterior end
C D

C:  Filariform (L3) hookworm larva in a wet mount.
D:  Close-up of the posterior end of a filariform (L3) hookworm larva.

 
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