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Presentation
Using Location Quotients to Analyze the Spatial Distribution of U.S. Cholera Cases Related to Post-Earthquake Hispaniola (Poster Session)
Poster presented at the AGM of the AAG (2013)
  • Jose Millan, Georgia Southern University
  • Robert Yarbrough, Georgia Southern University
  • Mark R. Welford, Georgia Southern University
  • Brian H. Bossak, Georgia Southern University
Abstract
Global transportation infrastructure has created a 'small world' environment, where both people and infectious disease move with comparative ease and alacrity. Formerly endemic or isolated diseases are no longer geographically restricted. Thus, it has become increasingly important to develop and explore predictive measures regarding the transmission of communicable diseases. This research examined the utility of location quotients as a predictive tool involving geographically-isolated infectious disease outbreaks. We utilized the Hispaniola cholera outbreak that took place after the devastating earthquake of 2010 as a pilot study. We mapped U.S. cholera cases, aggregated by state, as reported by the Centers for Disease Control and generated a map of location quotients for states that had incidence of cholera. Location Quotients (LQs) are a measure of relative concentration commonly used in geography, demographics, and economics. Specifically, LQs are ratios, often comparing a subset of a geographic area (e.g., state) with a larger geographic area (e.g., country). We calculated LQs as a means to identify areas with a concentration of residents self-identifying as having Dominican or Haitian ancestry under the hypothesis that the spatial distribution of U.S. cholera cases may be associated with VFR (Visiting Friends and Relatives) travel. We found a positive correlation between state-level U.S. cholera cases and calculated LQs. The results suggest that LQs may be useful for increasing or concentrating disease surveillance activities, especially among VFR travelers. This research is significant in that it demonstrates one possible use of location quotients as a predictive tool in relation to highly-infectious diseases.
Keywords
  • Cholera,
  • GIS,
  • Location quotients,
  • Hispaniola
Disciplines
Publication Date
2013
Citation Information
Jose Millan, Robert Yarbrough, Mark R. Welford and Brian H. Bossak. "Using Location Quotients to Analyze the Spatial Distribution of U.S. Cholera Cases Related to Post-Earthquake Hispaniola (Poster Session)" Poster presented at the AGM of the AAG (2013)
Available at: http://works.bepress.com/mark_welford/33/