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Spatial analysis of scrub typhus infection and its association with environmental and socioeconomic factors in Taiwan.
Acta Trop 2011 Oct-Nov; 120(1-2):52-8AT

Abstract

We analyzed the spatial distribution of human cases of scrub typhus on the main island of Taiwan from 2003 to 2008 and implemented an island-wide survey of scrub typhus vectors (trombiculid chiggers) in 2007 and 2008. The standardized incidence rate 'SIR' incorporating inter-district variations in population, gender and age was correlated with environmental and socioeconomic variables. Higher incidence and SIR rates were clustered in the less developed, mountainous regions of central and eastern Taiwan. Higher SIRs were also associated with a higher proportion of dry-field farmers in the population, a higher normalized difference vegetation index (NDVI) and lower mean annual temperature, but was not associated with rainfall. Small mammal hosts in high-SIR districts harbored more chiggers and had higher rates of seropositivity against Orientia tsutsugamushi Hyashi, the etiologic agent of scrub typhus, compared to low-SIR districts. The concurrence of a higher proportion of dry-field farmers and higher NDVI has likely led to the clustering of scrub typhus in the mountainous regions of Taiwan. Further individual-level study of the risk factors associated with scrub typhus, and a better understanding of the effect of environmental factors on chigger abundance, should help to prevent scrub typhus in Taiwan.

Authors+Show Affiliations

Research and Diagnostic Center, Centers for Disease Control, Department of Health, Taipei, Taiwan, ROC.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21703220

Citation

Kuo, Chi-Chien, et al. "Spatial Analysis of Scrub Typhus Infection and Its Association With Environmental and Socioeconomic Factors in Taiwan." Acta Tropica, vol. 120, no. 1-2, 2011, pp. 52-8.
Kuo CC, Huang JL, Ko CY, et al. Spatial analysis of scrub typhus infection and its association with environmental and socioeconomic factors in Taiwan. Acta Trop. 2011;120(1-2):52-8.
Kuo, C. C., Huang, J. L., Ko, C. Y., Lee, P. F., & Wang, H. C. (2011). Spatial analysis of scrub typhus infection and its association with environmental and socioeconomic factors in Taiwan. Acta Tropica, 120(1-2), pp. 52-8. doi:10.1016/j.actatropica.2011.05.018.
Kuo CC, et al. Spatial Analysis of Scrub Typhus Infection and Its Association With Environmental and Socioeconomic Factors in Taiwan. Acta Trop. 2011;120(1-2):52-8. PubMed PMID: 21703220.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spatial analysis of scrub typhus infection and its association with environmental and socioeconomic factors in Taiwan. AU - Kuo,Chi-Chien, AU - Huang,Jing-Lun, AU - Ko,Chia-Ying, AU - Lee,Pei-Fen, AU - Wang,Hsi-Chieh, Y1 - 2011/06/14/ PY - 2011/02/09/received PY - 2011/05/09/revised PY - 2011/05/29/accepted PY - 2011/6/28/entrez PY - 2011/6/28/pubmed PY - 2012/3/17/medline SP - 52 EP - 8 JF - Acta tropica JO - Acta Trop. VL - 120 IS - 1-2 N2 - We analyzed the spatial distribution of human cases of scrub typhus on the main island of Taiwan from 2003 to 2008 and implemented an island-wide survey of scrub typhus vectors (trombiculid chiggers) in 2007 and 2008. The standardized incidence rate 'SIR' incorporating inter-district variations in population, gender and age was correlated with environmental and socioeconomic variables. Higher incidence and SIR rates were clustered in the less developed, mountainous regions of central and eastern Taiwan. Higher SIRs were also associated with a higher proportion of dry-field farmers in the population, a higher normalized difference vegetation index (NDVI) and lower mean annual temperature, but was not associated with rainfall. Small mammal hosts in high-SIR districts harbored more chiggers and had higher rates of seropositivity against Orientia tsutsugamushi Hyashi, the etiologic agent of scrub typhus, compared to low-SIR districts. The concurrence of a higher proportion of dry-field farmers and higher NDVI has likely led to the clustering of scrub typhus in the mountainous regions of Taiwan. Further individual-level study of the risk factors associated with scrub typhus, and a better understanding of the effect of environmental factors on chigger abundance, should help to prevent scrub typhus in Taiwan. SN - 1873-6254 UR - https://www.unboundmedicine.com/medline/citation/21703220/Spatial_analysis_of_scrub_typhus_infection_and_its_association_with_environmental_and_socioeconomic_factors_in_Taiwan_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0001-706X(11)00185-9 DB - PRIME DP - Unbound Medicine ER -