During the 2012 outbreak of West Nile virus in the United States, approximately one third of the cases were in Texas. Of those, about half occurred in northern Texas. Models based on infected blood donors and persons with neuroinvasive disease showed, respectively, that ≈0.72% and 1.98% of persons in northern Texas became infected.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4378495PMC
http://dx.doi.org/10.3201/eid2104.141178DOI Listing

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