Related Experiment Videos
Light, long-lasting Necator infection in a volunteer
1School of Public Health, Tulane University, New Orleans, Louisiana 70112.
The American Journal of Tropical Medicine and Hygiene
|October 1, 1988
Summary
Necator americanus infection in a volunteer lasted over 18 years, with egg counts per gram of feces (EPG) declining significantly over time. This long-term study provides insights into hookworm infection duration and egg shedding patterns.
Area of Science:
- Parasitology
- Infectious Diseases
- Tropical Medicine
Background:
- Necator americanus is a significant human hookworm pathogen.
- Understanding the long-term dynamics of hookworm infections is crucial for public health.
- This study documents a unique case of a prolonged Necator americanus infection.
Observation:
- A single volunteer was infected with Necator americanus larvae.
- Egg counts per gram of feces (EPG) were monitored for over 18 years.
- Periodic Kato thick-smear examinations were used to detect eggs, with some periods showing no eggs.
Findings:
- The infection persisted for over 18 years, with egg passage eventually ceasing permanently.
- Egg counts varied over time, with initial counts around 1,000 EPG, rising to 1,500 EPG for 5 years, and then dropping below 200 EPG.
- An estimated 37% of eggs were infertile during the first 14 years.
- Estimated female worm egg output decreased over the lifespan of the infection.
Implications:
- This case highlights the potential for long-term Necator americanus infections in humans.
- Findings suggest a decline in worm fecundity and egg production over extended infection periods.
- The study contributes to understanding the natural history and longevity of hookworm infections.