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Volume 24, Number 1—January 2018

Geogenomic Segregation and Temporal Trends of Human Pathogenic Escherichia coli O157:H7, Washington, USA, 2005–20141

Gillian A.M. TarrComments to Author , Smriti Shringi, Amanda I. Phipps, Thomas E. Besser, Jonathan Mayer, Hanna N. Oltean, Jon Wakefield, Phillip I. Tarr, and Peter Rabinowitz
Author affiliations: University of Calgary, Calgary, Alberta, Canada (G.A.M. Tarr); Washington State University, Pullman, Washington, USA (S. Shringi, T.E. Besser); University of Washington, Seattle, Washington, USA (A.I. Phipps, J. Mayer, J. Wakefield, P. Rabinowitz); Washington State Department of Health, Shoreline, Washington, USA (H.N. Oltean); Washington University School of Medicine, St. Louis, Missouri, USA (P.I. Tarr)

Main Article


Video. Lineage-specific probability surfaces for Escherichia coli O157:H7 from culture-confirmed human cases reported in Washington, USA, 2005–2014. Probabilities were determined by kernel-based estimation of spatial segregation for 3 intervals: 2005–2007 (n = 305, bandwidth = 1.0000); 2008–2010 (n = 367, bandwidth = 0.7256); and 2011–2014 (n = 439, bandwidth = 0.9314). Overall spatial segregation was not statistically significant for the 2005–2007 interval (p = 0.769) or 2011–2014 interval (p = 0.138) but was statistically significant for the 2008–2010 interval (p = 0.001). Circles indicate case locations. Darker hues indicate higher risk. Contour lines marked 0.025 define areas in which there is a high probability of cases being caused by a given lineage, suggesting spatial segregation. There is an area of statistically significant spatial segregation for lineage IIb in all 3 intervals. Contour lines marked 0.975 define areas in which there is a low probability of cases being caused by the given lineage. (Source)

Main Article

1Preliminary results from this study were presented at the International Meeting on Emerging Diseases and Surveillance (IMED), November 4–7, 2016, Vienna, Austria.

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