West Nile virus remains an important public health concern since appearing in the United States back in 1999. Part of the challenge is dealing with the unpredictability of outbreaks. A new study examined whether certain factors could help guide future interventions, education and prevention associated with West Nile virus infections. Catherine Dolf explains in this week’s JAMA Report. Source: The 2012 West Nile Encephalitis Epidemic in Dallas, Texas