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Ancylostoma Braziliense

Ancylostoma braziliense is a hookworm species related to the human hookworms A. duodenale and Necator americanus. While A. braziliense can penetrate human skin, causing cutaneous larval migrans, it does not develop further in humans. The normal life cycle involves eggs passing in dog or cat feces, hatching, and developing into infective larvae that penetrate the animal host's skin, travel to the lungs and are swallowed, reaching the small intestine to mature into adults. Humans can become infected through skin penetration by larvae, which then migrate aimlessly in the epidermis.

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226 views2 pages

Ancylostoma Braziliense

Ancylostoma braziliense is a hookworm species related to the human hookworms A. duodenale and Necator americanus. While A. braziliense can penetrate human skin, causing cutaneous larval migrans, it does not develop further in humans. The normal life cycle involves eggs passing in dog or cat feces, hatching, and developing into infective larvae that penetrate the animal host's skin, travel to the lungs and are swallowed, reaching the small intestine to mature into adults. Humans can become infected through skin penetration by larvae, which then migrate aimlessly in the epidermis.

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nikko estrada
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Ancylostoma braziliense

Eukarya
Misc CDC parasites

Overview
Brief Summary
Ancylostoma braziliense is related to the main nematode worms known as human hookworms, A. duodenale and Necator americanus
. In contrast to these two species, however, although A. braziliense nematodes can penetrate the human skin (causing cutaneous larval
migrans), they do not develop any further. Cutaneous larval migrans (also known as "creeping eruption" or "ground itch") is a zoonotic
infection (i.e.,an infection transmitted from non-human animals to humans) caused by hookworm species that do not use humans as a
definitive host. The condition results from migrating larvae that cause an intensely itchy track in the upper dermis and is most commonly
caused by A. braziliense and A. caninum (the normal definitive hosts for these species are dogs and cats).
The normal life cycle for A. braziliense is very similar to the cycle for human hookworms in humans: Eggs are passed in the stool and
under favorable conditions (moisture, warmth, shade) larvae hatch in 1 to 2 days. The released rhabditiform larvae grow in the feces
and/or the soil and after 5 to 10 days (and two molts) they become filariform (third-stage) larvae that are infective. These infective larvae
can survive 3 to 4 weeks in favorable environmental conditions. On contact with the animal host, the larvae penetrate the skin and are
carried through the blood vessels to the heart and then to the lungs. They penetrate into the pulmonary alveoli, ascend the bronchial tree
to the pharynx, and are swallowed. The larvae reach the small intestine, where they establish themselves and mature into adults. Adult
worms live in the lumen of the small intestine, where they attach to the intestinal wall. Some larvae become arrested in the tissues, and
serve as source of infection for pups via transmammary (and possibly transplacental) routes. Humans may also become infected when
filariform larvae penetrate the skin. In a human host, the larvae cannot mature further, but may migrate aimlessly within the epidermis,
sometimes as much as several centimeters a day. Some larvae may persist in deeper tissue after finishing their skin migration. (Source:
Centers for Disease Control Parasites and Health Website)
Ancylostoma braziliense has a mainly tropical and subtropical distribution; in the United States it occurs in the Gulf Coast region (Zajac
and Conboy 2006).
Author(s): Shapiro, Leo
Rights holder(s): Shapiro, Leo

References
Hotez, P. J., Brooker S., Bethony J. M., Bottazzi M E., Loukas A., & Xiao S. (2004).Hookworm Infection.
New England Journal of Medicine. 351(8), 799 - 807.
Zajac, A. M., & Conboy G. A. (2006).Veterinary Clinical Parasitology, 7th edition. Hoboken, New Jersey
(U.S.A.): Wiley-Blackwell.

Life cycle of the hookworms Ancylostoma braziliense and A. caninum


Photographer: Centers for Disease Control/Division of Parasitic Diseases and Malaria Submitted by: Shapiro, Leo Rights holder: Centers
for Disease Control/Division of Parasitic Diseases and Malaria

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