Wed . 19 Apr 2019

Disease diffusion mapping

disease mapping, disease mapping with winbugs and mlwin
Disease diffusion occurs when a disease is transmitted to a new location It implies that a disease spreads, or pours out, from a central source The idea of showing the spread of disease using a diffusion pattern is relatively modern, compared to earlier methods of mapping disease, which are still used today According to Rytokonen, the goals of disease mapping are: 1 to describe the spatial variation in disease incidence to formulate an etiological hypothesis; 2 to identify areas of high risk in order to increase prevention; and 3 to provide a map of disease risk for a region for better risk preparedness

Torsten Hägerstrand’s early work on “waves of innovation” is the basis that many medical cartographers and geographers use for mapping spatial diffusion 1968 The diffusion of disease can be described in four patterns: expansion diffusion, contagious diffusion, hierarchal diffusion and relocation diffusion Cromley and McLafferty also mention network diffusion and mixed diffusion

The diffusion of infectious disease tends to occur in a ‘wave’ fashion, spreading from a central source Pyle mentions barriers that pose a resistance towards a wave of diffusion, which include but are not limited to: physiographic features ie mountains, water bodies, political boundaries, linguistic barriers, and with diseases, a barrier could be differing control programs The diffusion of disease can be identified as a normal distribution over time and translated into an S-shaped curve to show the phases of disease diffusion The phases are: Infusion 25th percentile, Inflection 50th percentile, Saturation 75th percentile, and Waning to the upper limits

Disease diffusion types

Spreading wildfire showing expansion diffusion
  • Expansion diffusion occurs when the spreading phenomenon has a source and diffuses outwards into new areas, an example being a spreading wildfire
  • Relocation diffusion occurs when the spreading phenomenon migrates into new areas, leaving behind its origin or source of the disease
  • Contagious diffusion is the spread of an infectious disease through the direct contact of individuals with those infected
  • Hierarchal diffusion occurs when a phenomenon spreads through an ordered sequence of classes or places
  • Network diffusion occurs when a disease spreads via transportation and social networks, "reflecting the geographical and social structuring of human interactions"
  • Mixed diffusion is a combination of contagious diffusion and hierarchal diffusion AIDS is a prominent example in modern-day society of a mixed diffusion disease, often spreading along the hierarchal, network, and contagious diffusion patterns

The value of mapping and Geographic Information Systems GIS is becoming better known to public health professionals to help link disease control to prevention efforts, which can aid in developing better immunization programs GIS is an excellent tool used to identify spatial patterns and core areas of disease transmission Disease maps can distinguish the low and high risk areas, as well as highlight “physical and/or socio-cultural” factors that contribute to the causation of disease Understanding how a disease spreads gives health officials a better understanding of how to better serve the public

References

  1. ^ a b Cromley, Ellen K and Sarah L McLafferty GIS and Public Health The Guilford Press, New York, 2002 pp 189-209
  2. ^ Pyle, Gerald F "Studies of Disease Diffusion" Applied Medical Geography VH Winston & Sons, Washington, DC, 1979: pp 123
  3. ^ Walter, SD "Disease Mapping: a historical perspective" Spatial Epidemiology: Methods and Applications Eds P Elliot, JC Wakfield, NG Best, and DJ Briggs Oxford University Press, 2000 pp 225
  4. ^ Rytokonen, Mike, JP "Not All Maps are Equal: GIS and Spatial Analysis in Epidemiology" International Journal of Circumpolar Health 63:1, 2004: pp 11
  5. ^ Koch, Tom Geographies of Disease: Maps, Mapping, and Medicine ESRI Press Redlands, California, 2005 Ch 10, pp 249-281
  6. ^ Hornsby, 2000 from Cliff et al 1981: Pyle, 1979, 137 from Gould, 1969
  7. ^ Pyle, Gerald F "Studies of Disease Diffusion" Applied Medical Geography VH Winston & Sons, Washington, DC, 1979: pp 138
  8. ^ Pyle, Gerald F "Studies of Disease Diffusion" Applied Medical Geography VH Winston & Sons, Washington, DC, 1979: pp 139
  9. ^ a b Cromley, Ellen K and Sarah L McLafferty GIS and Public Health The Guilford Press, New York, 2002 pp 192
  10. ^ Hornsby, Kathleen "Spatial Diffusion: Conceptualizations and Formalizations" National Center for Geographic Information and Analysis and Department of Spatial Information Science and Engineering, University of Maine, 2000: Pyle, Gerald F "Studies of Disease Diffusion" Applied Medical Geography VH Winston & Sons, Washington, DC, 1979: pp 123-163
  11. ^ Cromley, Ellen K and Sarah L McLafferty GIS and Public Health The Guilford Press, New York, 2002 pp 194
  12. ^ Rytkonen, Mika, JP "Not All Maps are Equal: GIS and Spatial Analysis in Epidemiology" International Journal of Circumpolar Health 63:1, 2004: pp 18

4 Rytkönen, Mika JP “Not All Maps are Equal: GIS and Spatial Analysis in Epidemiology” International Journal of Circumpolar Health 63:1, 2004: pp 11 Available: http://wwwcircumpolarhealthjournalnet/indexphp/ijch/article/viewFile/17642/20108

Further reading

  • Geographic Information Systems GIS at CDC, Centers for Disease Control and Prevention, US
  • GIS in Public Health, Agency for Toxic Substances and Disease Registry ATSDR, US
  • Clarke, Keith C; Sara L McLafferty; Barbara J Tempalski April–June 1996 "On Epidemiology and Geographic Information Systems: A Review and Discussion of Future Directions" Emerging Infectious Diseases 2 2: 85–92 doi:103201/eid0202960202 PMC 2639830  PMID 8903207 Retrieved 2007-12-25 
  • Infectious diseases: How they spread, how to stop them, CNN
  • Cashio, Cathy Mapping infectious disease outbreaks, University of North Texas Resources Magazine 2004

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    Disease diffusion mapping beatiful post thanks!

    29.10.2014


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