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Spatial distribution of Mycobacterium Tuberculosis in metropolitan Harare, Zimbabwe

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Listed:
  • Joconiah Chirenda
  • Isaiah Gwitira
  • Robin M Warren
  • Samantha L Sampson
  • Amon Murwira
  • Collen Masimirembwa
  • Kudzanai M Mateveke
  • Cremence Duri
  • Prosper Chonzi
  • Simbarashe Rusakaniko
  • Elizabeth M Streicher

Abstract

Introduction: The contribution of high tuberculosis (TB) transmission pockets in propagating area-wide transmission has not been adequately described in Zimbabwe. This study aimed to describe the presence of hotspot transmission of TB cases in Harare city from 2011 to 2012 using geospatial techniques. Methods: Anonymised TB patient data stored in an electronic database at Harare City Health department was analysed using geospatial methods. Confirmed TB cases were mapped using geographic information system (GIS). Global Moran’s I and Anselin Local Moran’s I (LISA) were used to assess clustering and the local Getis-Ord Gi* was used to estimate hotspot phenomenon of TB cases in Harare City for the period between 2011 and 2012. Results: A total of 12,702 TB cases were accessed and mapped on the Harare City map. In both 2011 and 2012, ninety (90%) of cases were new and had a high human immunodeficiency virus (HIV)/TB co-infection rate of 72% across all suburbs. Tuberculosis prevalence was highest in the Southern district in both 2011 and 2012. There were pockets of spatial distribution of TB prevalence across West South West, Southern, Western, South Western and Eastern health districts. TB hot spot occurrence was restricted to the West South West, parts of South Western, Western health districts. West South West district had an increased peri-urban population with inadequate social services including health facilities. These conditions were conducive for increased intensity of TB occurrence, a probable indication of high transmission especially in the presence of high HIV co-infection. Conclusions and recommendations: Increased TB transmission was limited to a health district with high informal internal migrants with limited health services in Harare City. To minimise spread of TB into greater Harare, there is need to improve access to TB services in the peri-urban areas.

Suggested Citation

  • Joconiah Chirenda & Isaiah Gwitira & Robin M Warren & Samantha L Sampson & Amon Murwira & Collen Masimirembwa & Kudzanai M Mateveke & Cremence Duri & Prosper Chonzi & Simbarashe Rusakaniko & Elizabeth, 2020. "Spatial distribution of Mycobacterium Tuberculosis in metropolitan Harare, Zimbabwe," PLOS ONE, Public Library of Science, vol. 15(4), pages 1-16, April.
    • Handle: RePEc:plo:pone00:0231637
    DOI: 10.1371/journal.pone.0231637
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    References listed on IDEAS

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    1. J. Keith Ord & Arthur Getis, 2001. "Testing for Local Spatial Autocorrelation in the Presence of Global Autocorrelation," Journal of Regional Science, Wiley Blackwell, vol. 41(3), pages 411-432, August.
    2. Arthur Getis & J. Keith Ord, 2010. "The Analysis of Spatial Association by Use of Distance Statistics," Advances in Spatial Science, in: Luc Anselin & Sergio J. Rey (ed.), Perspectives on Spatial Data Analysis, chapter 0, pages 127-145, Springer.
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