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Arboviral diseases and poverty in Alabama, 2007–2017

Author

Listed:
  • Donal Bisanzio
  • Elisa Martello
  • Katherine Izenour
  • Kelly Stevens
  • Ramandeep Kaur
  • Benjamin A McKenzie
  • Moritz Kraemer
  • Richard Reithinger
  • Sarah Zohdy

Abstract

Mosquito-borne viruses cause diseases of great public health concern. Arboviral disease case distributions have complex relationships with socioeconomic and environmental factors. We combined information about socio-economic (population, and poverty rate) and environmental (precipitation, and land use) characteristics with reported human cases of arboviral disease in the counties of Alabama, USA, from 2007–2017. We used county level data on West Nile virus (WNV), dengue virus (DENV), chikungunya virus (CHIKV), Zika virus (ZIKV), California serogroup virus, Eastern equine encephalitis virus, and Saint Louis encephalitis virus to provide a detailed description of their spatio-temporal pattern. We found a significant spatial convergence between incidence of WNV and poverty rate clustered in the southern part of Alabama. DENV, CHIKV and ZIKV cases showed a different spatial pattern, being mostly located in the northern part, in areas of high socioeconomic status. The results of our study establish that poverty-driven inequities in arboviral risk exist in the southern USA, and should be taken into account when planning prevention and intervention strategies.Author summary: Mosquito-borne arboviruses like West Nile virus (WNV), dengue virus (DENV), chikungunya virus (CHIKV), Zika virus (ZIKV), California serogroup virus (CSV), Eastern equine encephalitis virus (EEE), and Saint Louis encephalitis virus (SLE) are on the rise globally. Socioeconomic and environmental conditions have played a role in directing in this expansion by creating conditions ideal for mosquito vectors and transmission. In this study, we used 10 years (2007–2017) of county level human arboviral case data from the US state of Alabama to better understand the roles socioeconomics (poverty rate) and environmental (land use, precipitation, land cover) conditions may play in driving patterns of arboviral disease in the southern US. We found a significant association between poverty rate and incidence of WNV, an arbovirus primarily transmitted by Culex spp. mosquitoes, which are known for thriving in contaminated water sources and sewage overflow. Conversely, cases of DENV, CHIKV, and ZIKV, arboviruses primarily transmitted by Aedes spp. mosquitoes, were reported in areas of high socioeconomic status. These findings suggest differential distribution of arboviruses relevant to human health in Alabama, and that poverty in the southern US is a significant factor that should be considered when planning WNV prevention and intervention strategies.

Suggested Citation

  • Donal Bisanzio & Elisa Martello & Katherine Izenour & Kelly Stevens & Ramandeep Kaur & Benjamin A McKenzie & Moritz Kraemer & Richard Reithinger & Sarah Zohdy, 2021. "Arboviral diseases and poverty in Alabama, 2007–2017," PLOS Neglected Tropical Diseases, Public Library of Science, vol. 15(7), pages 1-13, July.
    • Handle: RePEc:plo:pntd00:0009535
    DOI: 10.1371/journal.pntd.0009535
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