West Nile Watch Update - Mosquito samples have tested positive in... Dallas County Health & Human Services sent this bulletin at 06/25/2020 01:09 PM CDT Having trouble viewing this email? View it as a Web page. West Nile Watch Update - June 25, 2020 Mosquito samples have tested positive for West Nile virus in the following areas: Dallas - 75208 and 75212 (2 New Pools)