Hookworm infects hundreds of millions of people and is one of the principal causes of iron-deficiency anaemia in the developing world. Ivermectin has activity against it, but it is not the first-line treatment — albendazole is considerably more effective against adult intestinal hookworm. Where ivermectin becomes valuable is in co-infection and in the skin form of the disease.
Two species account for nearly all human infection: Necator americanus and Ancylostoma duodenale. Larvae live in warm, moist soil contaminated with human faeces and penetrate intact skin, most often the soles of bare feet.
From the skin they travel through the bloodstream to the lungs, are coughed up and swallowed, and mature in the small intestine. There the adults attach to the intestinal wall and feed on blood.
The clinical burden comes from that blood loss. Each adult worm consumes a small but steady quantity of blood daily, and a heavy worm burden sustained over years produces the chronic iron-deficiency anaemia that defines the disease. In children this contributes to impaired growth and cognitive development, which is why hookworm has such a large impact on population health.
Albendazole 400 mg as a single dose produces cure rates typically in the region of 70 to 95 percent against hookworm. Mebendazole is also used, though single-dose cure rates against hookworm specifically are lower and it performs better over a three-day course.
Ivermectin alone gives distinctly lower cure rates against adult intestinal hookworm than albendazole. The mechanistic reason matters: ivermectin's glutamate-gated chloride channel target is not equally distributed or equally accessible across all helminth species, and hookworm is one where it performs less well.
A drug being effective against many parasites does not make it the best against every one, and hookworm is a clear illustration.
Co-infection. Soil-transmitted helminths travel together. Someone with hookworm frequently also carries Strongyloides, Ascaris or Trichuris. Albendazole handles hookworm well but is unreliable against strongyloidiasis, where ivermectin is clearly the drug of choice. Treating both with a combination is often the practical answer.
Combination therapy. Albendazole plus ivermectin has been studied in soil-transmitted helminth programmes and produces higher cure rates against Trichuris than either drug alone, while retaining albendazole's efficacy against hookworm and Ascaris. Combination approaches are increasingly favoured in mass drug administration for exactly this breadth.
Cutaneous larva migrans. This is where ivermectin excels. Animal hookworm larvae, usually from dogs or cats, penetrate human skin but cannot complete their lifecycle, so they wander through the epidermis producing the intensely itchy, serpiginous, slowly advancing track known as creeping eruption. A single dose of ivermectin at 200 mcg/kg is highly effective and is widely regarded as the treatment of choice.
Killing the worms stops ongoing blood loss but does not replace iron already lost. Iron supplementation alongside antiparasitic treatment is standard where anaemia is significant, and recovery of haemoglobin takes weeks to months.
Reinfection is common where sanitation and footwear are the underlying problem, which is why hookworm control programmes pair periodic mass treatment with sanitation improvement rather than relying on drugs alone.
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View products and pricingIt has activity against hookworm but is less effective than albendazole against the adult intestinal worms, so it is not first line. It is valuable in co-infection, in combination therapy, and it is the treatment of choice for cutaneous larva migrans caused by animal hookworm larvae.
Albendazole 400 mg as a single dose is standard first line, with cure rates typically between 70 and 95 percent. Mebendazole is an alternative, performing better over a three-day course than as a single dose.
An itchy, winding, slowly advancing track in the skin caused by animal hookworm larvae that penetrate human skin but cannot complete their lifecycle. A single dose of ivermectin at 200 mcg/kg is highly effective and generally the treatment of choice.
Adult worms attach to the intestinal wall and feed on blood. A heavy burden sustained over years produces chronic iron-deficiency anaemia, which in children also impairs growth and cognitive development.
Usually, where anaemia is significant. Antiparasitic treatment stops the ongoing blood loss but does not replace iron already lost, and haemoglobin recovery takes weeks to months.