Risk factors for acquiring scrub typhus among the adults

Tina George, Sudha Rajan, John Peter, Samuel Hansdak, John Prakash, Ramya Iyyadurai, Alice Mathuram, Belavendra Antonisamy, Kavitha Ramanathan, Thambu Sudarsanam

Research output: Contribution to journalArticle

Abstract

Background: Behavioral and geographical factors may play a role in the acquisition of scrub typhus infection. In this prospective case-control study, we studied the factors associated with infection. Patients and Methods: Consecutive adult patients admitted with scrub typhus infection over 10 months were recruited. For every case, a geographical control from the same area and a gender-matched clinical control admitted with acute febrile illness were enrolled. The risk factors, which included sanitation, environment, activity, and protective measures, were compared between cases and controls using univariable and multivariable conditional logistic regression analysis and expressed as odds ratio (OR) with 95% confidence interval (CI). Results: The study cohort (n = 225; 132 female) aged 44 ± 17 years comprised of 75 cases and 150 controls from mid to low socioeconomic background. When compared with clinical controls, on univariable conditional regression analysis, cases were more likely to be involved in farming or gardening and less likely to have a toilet within the house. On multivariate regression analysis, only involvement in farming or gardening was associated with infection (OR: 4.2, 95% CI: 1.5-11.5). When compared with geographical controls, on univariable conditional regression analysis, cases were less likely to change undergarments or clothes before sleeping (OR: 3.5, 95% CI: 1.3-9.5) and more likely to have rodents in their house (OR: 2.5, 95% CI: 1-6.4) and rest on grass/mud without a mat (OR: 2.4, 95% CI: 1.1-5.3). On multivariate regression analysis, not changing undergarments or clothes tended to be associated with infection (OR: 2.7, 95% CI: 0.98-7.3). Conclusion: Certain behavioral factors predisposed our cohort to develop scrub typhus infection. Lifestyle changes may reduce the burden of scrub typhus in South India.

Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalJournal of Global Infectious Diseases
Volume10
Issue number3
DOIs
Publication statusPublished - Jul 1 2018

Keywords

  • Case-control
  • risk factors
  • scrub typhus
  • South India

ASJC Scopus subject areas

  • Infectious Diseases

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    George, T., Rajan, S., Peter, J., Hansdak, S., Prakash, J., Iyyadurai, R., Mathuram, A., Antonisamy, B., Ramanathan, K., & Sudarsanam, T. (2018). Risk factors for acquiring scrub typhus among the adults. Journal of Global Infectious Diseases, 10(3), 147-151. https://doi.org/10.4103/jgid.jgid_63_17