Terrestrial Bird Migration and West Nile Virus Circulation, United States
Daniele Swetnam, Steven G. Widen, Thomas G. Wood, Martin Reyna, Lauren Wilkerson, Mustapha Debboun, Dreda A. Symonds, Daniel G. Mead, Barry J. Beaty, Hilda Guzman, Robert B. Tesh, and Alan D.T. Barrett
Author affiliations: University of California at Davis, Davis, California, USA (D. Swetnam); University of Texas Medical Branch, Galveston, Texas, USA (D. Swetnam, S.G. Widen, T.G. Wood, H. Guzman, R.B. Tesh, A.D.T. Barrett); Harris County Public Health, Houston, Texas, USA (M. Reyna, L. Wilkerson, M. Debboun); Chesapeake Mosquito Control Commission, Chesapeake, Virginia, USA (D.A. Symonds); University of Georgia, Athens, Georgia, USA (D.G. Mead); Colorado State University, Fort Collins, Colorado, USA (B.J. Beaty)
Figure 5. Incidence-controlled phylogeny of Eastern and Central flyways, United States. Sequences were down-sampled such that the number of sequences was proportional to the annual incidence of West Nile neurologic disease incidence for each location between 2001 and 2009. Down-sampling was undertaken twice (A and B) to ensure that the reduction in sequences did not result in a substantial loss of diversity. Illinois, North Dakota, and South Dakota were not included in the incidence-control analysis because too few sequences were available to support down-sampling. Bayesian approaches were used to generate maximum-clade credibility trees. Scale bars indicate nucleotide substitutions per site.
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