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Age-dependent epidemiological patterns and strain diversity in helminth parasites
1Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut 06520, USA. alison.galvani@yale.edu
The Journal of Parasitology
|April 29, 2005
Summary
Helminth infection intensity peaks in adolescents, often attributed to poor adult immunity. This study suggests multiple parasite strains, not poor immunity, explain age-related infection patterns in humans.
Area of Science:
- Parasitology
- Epidemiology
- Immunology
Background:
- Helminth infections like schistosomiasis, trichuriasis, and ascariasis show age-dependent prevalence and intensity.
- Peak infections typically occur in 10-14 year olds in endemic areas.
- Current understanding suggests poor adult immunity to reinfection due to repeated exposure to single parasite strains.
Purpose of the Study:
- To propose an alternative explanation for age-dependent helminth infection patterns.
- To challenge the assumption of poor human immunity against helminth reinfection.
Main Methods:
- Analysis of field data on helminth infections.
- Development and application of a simplified model of helminth transmission.
Main Results:
- The study proposes that the circulation of multiple helminth strains, each inducing strong protective immunity, explains observed age-related infection patterns.
- This contrasts with the traditional view of poor immunity acquisition in adults.
Conclusions:
- Observed age-intensity profiles of helminth infections may be explained by strain diversity rather than host immune deficiency.
- Reevaluation of epidemiological parameters and control strategies for helminth diseases may be necessary if this hypothesis is correct.