West Nile Virus Activity in Texas

West Nile virus (WNV) is a mosquito-borne arbovirus (arthropod-borne virus) transmitted through the bite of an infected mosquito. This virus was first isolated from a woman in the West Nile province (which it was named for) of Uganda in 1937. The virus was first introduced into the United States in 1999 and has since spread across the continent. WNV was first detected in Houston, Texas (Harris County) in 2002 and has been cycling annually in the state ever since. The primary vector of this virus in Texas is the southern house mosquito, Culex quinquefasciatus. This mosquito species can be found throughout Texas and breeds in septic water or water that has been fouled with human or animal waste. For more information on WNV a factsheet is available here.

2002 WNV Activity in Texas

2002 WNV Activity in Texas Case Breakdown

2003 WNV Activity in Texas

2003 WNV Activity in Texas Case Breakdown

2004 WNV Activity in Texas

2004 WNV Activity in Texas Case Breakdown

2005 WNV Activity in Texas

2005 WNV Activity in Texas Case Breakdown

2006 WNV Activity in Texas

2006 WNV Activity in Texas Case Breakdown

2007 WNV Activity in Texas

2007 WNV Activity in Texas Case Breakdown

2008 WNV Activity in Texas

2008 WNV Activity in Texas Case Breakdown

2009 WNV Activity in Texas

2009 WNV Activity in Texas Case Breakdown

2010 WNV Activity in Texas