Lyme Disease in Northeastern USA

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Presentation transcript:

Lyme Disease in Northeastern USA Alexander Coster, Chelsey Cu, Kateryna Baranova, Lakshmi Soundarapandian

Overview Introduction Background Information Methodology Results Implications Conclusions

Introduction Test the occurrence of Lyme disease in northeastern United States in relation to climate and land cover change Focusing on 14 states identified by the Centre for Disease Control and Prevention (CDC) Used several environmental variables and MaxEnt technology

Background – What is Lyme Disease? Largest vector-borne disease in the United States, and an endemic in Europe and Asia Caused by black-legged ticks, which are a parasite to the host white-tailed deer Flu-like symptoms develop into multi-organ and system issues Has seen an increase over the last few years

Methodology Model 1: Climatic Variables Research data Gather data World-Clim, IPCC Climate Data, PRISM Climate Group, CGIAR, etc Parse data Vector to Raster Fix cell size, projection, extent Raster to ASCII Model 1: Climatic Variables Model 2: Climatic & Vegetation Variables Model 3: Climatic, Vegetation & Host Variables Model 4: Present & 2050 Climatic Variables

Results 2050 Extrapolation Climatic Variables 04 01 03 Climate, Vegetation and Host Variables Climatic & Vegetation Variables 02

Results Model 1 – Climatic Variables Prediction accuracy: 68% Individually, PET, average winter temperature, and winter vapour pressure are highest Winter vapour pressure, average summer and winter temperature, and PET are the highest when estimating the relative contribution of variables alongside all the other variables

Results Model 1 – Climatic Variables

Results Model 2 – Climatic & Vegetation Variables Prediction accuracy: 74% Mean temperature of coldest quarter, annual mean temperature, isothermal, and ecoregion

Results Model 2 – Climatic and Vegetation Variables

Results Model 3 – Climatic, Vegetation & Host Variables Prediction accuracy: 74% Mean temperature of coldest quarter, ecoregions and isothermal are the most important when looking in tandem with other variables

Results Model 3 – Climatic, Vegetation & Host Variables

Results Model 4 – 2050 Extrapolation Prediction accuracy: 74% Mean temperature of coldest quarter is still the highest variable both in isolation and with the most closely correlated variables

Results Model 4 – 2050 Extrapolation

Discussion, Understanding the Problems and Limitations Cases reported basis of patient residence Time of contraction could be different from symptoms and reporting Inconsistent methods of tracking human cases Use of administrative boundaries for reporting No strategic field sampling to validate current range predictions Loss of accuracy due to data conversions Assumption that optimal tick habitat determines lyme disease Some variables (vegetation, host populations) assumed unchanged

Questions?

References Adams, D. A., Thomas, K. R., Jajosky, R.A., Foster, L., Baroi, G., Sharp, P., (…), Anderson, W. J. (2017). Summary of Notifiable Infectious Diseases and Conditions – United States, 2015. Retrieved from https://www.cdc.gov/mmwr/volumes/64/wr/mm6453a1.htm?s_cid=mm6453a1_w Aucott, J. N., Crowder, L. A., Kortte, K. B. (2013). Development of a foundation for a case definition of post-treatment Lyme disease syndrome. International Journal of Infectious Diseases, v.17:6, e443-e449. Retrieved from https://ac-els-cdn-com.ezproxy.library.ubc.ca/S1201971213000465/1-s2.0-S1201971213000465- main.pdf?_tid=ec915307-d0d8-468e-a242-c43bf9b4fb14&acdnat=1524086719_4420c1c17ab43c9701e32aabd5b8dcd0 Brownstein, J. S., Holford, T. R., & Fish, D. (2003). A climate-based model predicts the spatial distribution of the lyme disease vector Ixodes scapularis in the United States. Environmental Health Perspectives, 111 (9), 1152-1157. Canadian Lyme Disease Foundation. (n.d.). Symptoms. Retrieved from https://canlyme.com/lyme-basics/symptoms/ Centers for Disease Control and Prevention. (2017). Lyme Disease: Data Statistics. Retrieved from https://www.cdc.gov/lyme/stats/index.html  Centers for Disease Control and Prevention. (2015). Lyme Disease: Transmission. Retrieved from https://www.cdc.gov/lyme/transmission/index.html Centers for Disease Control and Prevention. (2017). Lyme Disease: Treatment. Retrieved from https://www.cdc.gov/lyme/treatment/index.html Cheng, A., et al. (2017). Analyzing the potential risk of climate change on lyme disease in eastern Ontario, Canada using time series remotely sensed temperature data and tick population modelling. Remote Sensing, 9, 609.  Chen, D., et al. (2015). Analyzing the correlation between deer habitat and the component of the risk for lyme disease in eastern Ontario, Canada: a GIS approach. ISPRS International Journal of Geo-Information, 4 (1), 105-123.  Ozdeneral, E. (2015). GIS and remote sensing in the exploration of lyme disease epidemiology. International Journal of Environmental Research and Public Health, 12 (12), 15182-15203. 

References Malysa, S. (2017). What kind of climate do ticks survive in? Retrieved from https://sciencing.com/kind-climate-do-ticks-survive-8734880.html Marques, A. R. (2010). Lyme Disease: A Review. Current Asthma and Allergy Reports – Springer, v.10, 13–20. Retrieved from https://link.springer.com/content/pdf/10.1007%2Fs11882-009-0077-3.pdf Ozdeneral, E. (2015). GIS and remote sensing in the exploration of lyme disease epidemiology. International Journal of Environmental Research and Public Health, 12 (12), 15182-15203.  Phillips, S. J., Anderson, R. P. & Schapire, R. E. (2006). Maximum entropy modeling of species geographic distributions. Ecological Modelling, 190 (3), 231–259.  Phillips, S.J., Dudik, M. & Schapire, R.E. (2018) Maxent software for modeling species niches and distributions (Version 3.4.1). Retrieved from http://biodiversityinformatics.amnh.org/open_source/maxent/ Peterson, A. T., & Raghavan, R. K. (2017). The geographic distribution of Ixodes scapularis (Acari: Ixodidae) revisited: the importance of assumptions about error balance. Journal of Medical Entomology, 54 (4), 1080-1084.  Seukep, S. E., et al. (2015). An examination of the demographic and environmental variables correlated with lyme disease emergence in Virginia. EcoHealth, 12 (4), 634-644.  Stafford, K. C. & Williams, S. C. (2014). Deer, Ticks, and Lyme Disease: Deer Management as a Strategy for the Reduction of Lyme Disease. The Connecticut Agricultural Experiment Station. Retrieved from http://www.ct.gov/caes/lib/caes/documents/publications/fact_sheets/entomology/deer_&_ticks_fact_sheet.pdf University of Rhode Island. (2018). Tick Encounter Resource Center. Retrieved from http://www.tickencounter.org/ Wormser, G.P., et al. (2007). The Clinical Assessment, Treatment, and Prevention of Lyme Disease, Human Granulocytic Anaplasmosis, and Babesiosis: Clinical Practice and Guidelines by Infectious Disease Society of America. Clinical Infectious Diseases, 45 (7), 1089-1134.