West Nile Watch Update - Mosquito samples have tested positive in... Dallas County Health & Human Services sent this bulletin at 08/31/2021 06:00 PM CDT Having trouble viewing this email? View it as a Web page. West Nile Watch Update - August 31, 2021 Mosquito samples have tested positive for West Nile Virus in the following area(s): Balch Springs 75180 (1 pool) Irving 75039 (1 pool) 75063 (1 pool) Richardson 75080 (2 pools) 75081 (1 pool) 75082 (3 pools) (9 new pools)