• Hookworm is the second most prevalent parasite (after Ascaris lumbricoides) with an estimated 1.3 billion infected (1999)
  • .
  • In 1940, it was estimated that 457 million of the world’s 2,166 million people were infected with hookworm.This 20% infection rate continues to exist today.

  • Two major species of hookworm parasitize humans: Ancylostoma duodenale and Necator americanus.

  • The two species were traditionally endemic to distinct locations around the globe, but it is likely that these boundaries will continue to disappear with increased travel, etc. (see Country Information).

  • Major symptoms can include: anemia, itching, gastro-intestinal disorders, and listlessness.

AGENT: Nematoda (intestinal)
  • Ancylostoma duodenale
  • Necator americanus


  • A. duodenale = the Old World Hookworm
  • N. americanus = the New World Hookworm

Image source: http://www.sabin.org/hookworm_slides.htm