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Updated: Jan 20, 2026
Physiology of the Gastrointestinal System I: Ingestion and Propulsion
Exploratory study characterizing gastrointestinal physiological changes during controlled human hookworm infection
Thomas C Mules1,2, Mali Camberis1, Brittany Lavender1
1Malaghan Institute of Medical Research, Wellington, New Zealand.
Controlled hookworm infection in healthy adults temporarily lowers duodenal and small intestinal pH without impacting gut transit or motility. This finding is crucial for understanding hookworm
Area of Science:
- Gastroenterology
- Infectious Diseases
- Human Physiology
Background:
- Hookworm infection affects over 400 million globally, causing gastrointestinal issues, but its physiological impact is unclear.
- Controlled human hookworm infection is a potential therapy for gut diseases.
Purpose of the Study:
- To assess the effects of experimental *Necator americanus* infection on gastrointestinal transit, motility, and luminal pH in healthy adults.
Main Methods:
- 10 healthy adults were infected with *N. americanus* larvae.
- Gastrointestinal parameters were measured using the SmartPill™ Wireless Motility Capsule at baseline, acute (week 6), and chronic (weeks 24-48) infection phases.
Main Results:
- No significant changes in gastric emptying, small bowel, colonic, or whole gut transit times were observed.
- A transient reduction in duodenal and small intestinal pH occurred during acute infection, normalizing by the chronic phase.
- No significant alterations in intraluminal pressures, contraction frequency, or motility index were detected.
Conclusions:
- Controlled *N. americanus* infection in healthy adults causes a temporary decrease in duodenal and small intestinal pH.
- The absence of sustained gastrointestinal transit or motility disturbances supports the safety of controlled hookworm infection for therapeutic research.
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