3 out of 9 human cases of West Nile virus in Texas have more severe form of the disease KXAN.comTwo more mosquito samples test positive for West Nile in Williamson County KEYE TV CBS Austin7 Harris Co. residents infected with West Nile Virus, county health officials say KTRK-TVFirst West Nile virus human case reported in Dallas: DCHHS NBC DFW7 cases of West Nile virus confirmed in Harris County residents; over 500 positive mosquito samples KHOU.com