Table 2. Years in which West Nile virus sequences were available in study of terrestrial bird migration and West Nile virus circulation, United States*.

Location

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

NY

x

x

x

x

x

x

x

x

x

VA

x

x

x

x

x

x

x

x

x

x

x

GA

x

x

x

x

x

x

x

IL

x

x

x

x

x

x

TX

x

x

x

x

x

x

x

x

x

x

x

CO

x

x

x

x

x

x

x

ND

x

x

x

x

x

x

x

SD

x

x

x

x

x

x

x

*x, available; blank cells, not available.