Necator americanus (New World Hookworm) – Adult

  • Disease: Hookworm disease
  • Habitat in human: Small intestine
  • Diagnosis of infection: Microscopic examination of faeces to detect eggs
Morphological Features
  • N. americanus is shorter and more slender than A. duodenale
  • Shape – cylindrical
  • Colour: Creamy white or grey or reddish brown (when blood is ingested)
  • Cuticle surround the body – finely striated transversely
  • Anterior end bent dorsally like a hook; Dorsal bend of the head is more acute in americanus
  • Cephalic glands in anterior third of the body
  • Buccal capsule is smaller than that of A. duodenale.
  • Necator has a pair of cutting plates ventrally instead of teeth
  • Size: 7-9 x 0.3 mm; Males are smaller than females
  • Posterior end expands to a copulatory bursa
  • Size: 9-11 mm x 0.4 mm
  • Posterior end is pointed
  • Body cavity is occupied by ovary and coiled uterine tubes packed with eggs
  • Vulva is in the anterior third of the body