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Risk factors for scrub typhus infection in South India: population-based cohort study
Wolf-Peter Schmidt1, Neal Alexander2, Winsley Rose3
1Department of Disease Control, https://ror.org/00a0jsq62London School of Hygiene and Tropical Medicine, London, UK.
Epidemiology and Infection
|August 26, 2025
Summary
Scrub typhus risk factors vary by location's endemicity. While agricultural work is linked in low-prevalence areas, transmission in settlements is key in high-prevalence zones, with females at higher risk.
Area of Science:
- Infectious Diseases
- Epidemiology
- Public Health
Background:
- Scrub typhus, a significant mite-borne illness, disproportionately affects rural Asian populations.
- Understanding risk factors is crucial for targeted prevention strategies in endemic regions.
Purpose of the Study:
- To investigate socio-demographic, behavioral, and spatial determinants of scrub typhus.
- To analyze risk factors across varying levels of disease endemicity in South India.
Main Methods:
- A 2-year cohort study involving 2206 rural residents in Tamil Nadu, India.
- Data collection included questionnaires, annual blood sampling for seroconversion, and satellite imagery for land use analysis.
- Baseline seroprevalence was determined from 5602 samples.
Main Results:
- An incidence rate of 78/1000 person-years was observed.
- Female sex was an independent risk factor (RR 1.4).
- Agricultural activities showed a strong association with scrub typhus only in low-prevalence areas, while transmission within settlements dominated high-prevalence settings.
Conclusions:
- Agricultural activities are not a primary risk factor for scrub typhus overall.
- In highly endemic areas, transmission within human settlements is likely predominant.
- Risk factors and transmission dynamics differ significantly based on local disease prevalence.
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