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Ancylostoma ceylanicum is related to the primary nematode worms known as human hookworms, A. duodenale and Necator americanus. The main hosts of A. ceylanicum are apparently wild and domestic carnivores, but worms of this species can also invade and complete their development in humans, although it is not considered a major parasite of humans (Hotez et al. 2004). This species infects humans far less frequently than do the other two human hookworms, but is of particular interest to researchers because it can be studied in other natural animal hosts, such as the domestic dog. (Carroll and Grove 1984). Taweethavonsawat et al. (2010) report that A. ceylanicum is a common hookworm of dogs, cats, and humans in Asia and has also been found to infect dogs in Australia. Fujiwara et al. (2006) reviewed the comparative immunology of human and animal models of hookworm infection.
For many years A. ceylanicum was confused with A. braziliense, but the distinctiveness of these two species was established by morphological and breeding studies in the 1950s and 1960s (Carroll and Grove 1984 and references therein).
(additional source: Centers for Disease Control Parasites and Health Website)