Hospitalisations and outpatient visits for undifferentiated fever attributable to scrub typhus in rural South India: Retrospective cohort and nested case-control study

The burden of scrub typhus in endemic areas is poorly understood. This study aimed at estimating the proportion of hospitalisations and outpatient visits for undifferentiated fever in the community that may be attributable to scrub typhus. The study was a retrospective cohort with a nested case-cont...

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Veröffentlicht in:PLoS neglected tropical diseases 2019-02, Vol.13 (2), p.e0007160-e0007160
Hauptverfasser: Devamani, Carol S, Prakash, John A J, Alexander, Neal, Suzuki, Motoi, Schmidt, Wolf-Peter
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Prakash, John A J
Alexander, Neal
Suzuki, Motoi
Schmidt, Wolf-Peter
description The burden of scrub typhus in endemic areas is poorly understood. This study aimed at estimating the proportion of hospitalisations and outpatient visits for undifferentiated fever in the community that may be attributable to scrub typhus. The study was a retrospective cohort with a nested case-control study conducted in the South Indian state of Tamil Nadu. We conducted house-to-house screening in 48 villages (42965 people, 11964 households) to identify hospitalised or outpatient cases due to undifferentiated fever during the preceding scrub typhus season. We used scrub typhus IgG to determine past infection. We calculated adjusted odds ratios for the association between IgG positivity and case status. Odds ratios were used to estimate population attributable fractions (PAF) indicating the proportion of hospitalised and outpatient fever cases attributable to scrub typhus. We identified 58 cases of hospitalisation and 236 outpatient treatments. 562 people were enrolled as control group to estimate the background IgG sero-prevalence. IgG prevalence was 20.3% in controls, 26.3% in outpatient cases and 43.1% in hospitalised cases. The PAFs suggested that 29.5% of hospitalisations and 6.1% of outpatient cases may have been due to scrub typhus. In villages with a high IgG prevalence (defined as ≥15% among controls), the corresponding PAFs were 43.4% for hospitalisations and 5.6% for outpatients. The estimated annual incidence of scrub typhus was 0.8/1000 people (0.3/1000 in low, and 1.3/1000 in high prevalence villages). Evidence for recall error suggested that the true incidences may be about twice as high as these figures. The study suggests scrub typhus as an important cause for febrile hospitalisations in the community. The results confirm the adequacy of empirical treatment for scrub typhus in hospitalised cases with undifferentiated fever. Since scrub typhus may be rare among stable outpatients, the use of empirical treatment remains doubtful in these.
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This study aimed at estimating the proportion of hospitalisations and outpatient visits for undifferentiated fever in the community that may be attributable to scrub typhus. The study was a retrospective cohort with a nested case-control study conducted in the South Indian state of Tamil Nadu. We conducted house-to-house screening in 48 villages (42965 people, 11964 households) to identify hospitalised or outpatient cases due to undifferentiated fever during the preceding scrub typhus season. We used scrub typhus IgG to determine past infection. We calculated adjusted odds ratios for the association between IgG positivity and case status. Odds ratios were used to estimate population attributable fractions (PAF) indicating the proportion of hospitalised and outpatient fever cases attributable to scrub typhus. We identified 58 cases of hospitalisation and 236 outpatient treatments. 562 people were enrolled as control group to estimate the background IgG sero-prevalence. IgG prevalence was 20.3% in controls, 26.3% in outpatient cases and 43.1% in hospitalised cases. The PAFs suggested that 29.5% of hospitalisations and 6.1% of outpatient cases may have been due to scrub typhus. In villages with a high IgG prevalence (defined as ≥15% among controls), the corresponding PAFs were 43.4% for hospitalisations and 5.6% for outpatients. The estimated annual incidence of scrub typhus was 0.8/1000 people (0.3/1000 in low, and 1.3/1000 in high prevalence villages). Evidence for recall error suggested that the true incidences may be about twice as high as these figures. The study suggests scrub typhus as an important cause for febrile hospitalisations in the community. The results confirm the adequacy of empirical treatment for scrub typhus in hospitalised cases with undifferentiated fever. Since scrub typhus may be rare among stable outpatients, the use of empirical treatment remains doubtful in these.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>30802243</pmid><doi>10.1371/journal.pntd.0007160</doi><orcidid>https://orcid.org/0000-0001-7449-4152</orcidid><oa>free_for_read</oa></addata></record>
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subjects Adequacy
Adolescent
Adult
Aged
Aged, 80 and over
Ambulatory care
Analysis
Antibodies, Bacterial - blood
Beef cattle
Biology and Life Sciences
Care and treatment
Case studies
Case-Control Studies
Cohorts
Communities
Control
Earth Sciences
Endemic Diseases - statistics & numerical data
Epidemiology
Female
Fever
Fever - epidemiology
Fever - etiology
Health aspects
Hospitalization
Hospitalization - statistics & numerical data
Hospitals
Households
Humans
Illnesses
Immunoglobulin G
Immunoglobulin G - blood
Incidence
India - epidemiology
Infection
Infections
Male
Medicine
Medicine and Health Sciences
Middle Aged
Mortality
Odds Ratio
Orientia tsutsugamushi
Orientia tsutsugamushi - immunology
Outpatients
Pilot Projects
Prevalence
Ratios
Recall errors
Research and Analysis Methods
Retrospective Studies
Rural areas
Rural Population - statistics & numerical data
Scrub typhus
Scrub Typhus - complications
Scrub Typhus - epidemiology
Seasons
Social Sciences
Studies
Towns
Tropical diseases
Typhus
Villages
Young Adult
title Hospitalisations and outpatient visits for undifferentiated fever attributable to scrub typhus in rural South India: Retrospective cohort and nested case-control study
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