Mosquito Surveillance and Test Results

Mosquito Surveillance and Results

The City of Southlake uses six gravid traps to conduct mosquito surveillance. These traps use dirty water to attract female mosquitoes that have just taken a blood meal and need a place to lay eggs. Once the mosquito comes near the dirty water, a small electric fan sucks them into the trap. The trapped mosquitoes are then collected and tested for the presence of West Nile Virus by Tarrant County Public Health.

Surveillance Results

The chart below shows the date that samples were tested, along with the test results. Also shown is the average number of the Culex Quinquefasciatus mosquito (the mosquito primarily responsible for transmitting WNV), as well as the average total of all species of mosquitoes trapped that week. The City monitors these numbers as part of its response to evaluate trends and to determine the effectiveness of larviciding and outreach initiatives.

Southlake Surveillance Results
Date                             Result                    Average C. Quink  Average Total   
April 15th, 2014  Negative  0 24 
April 24th, 2014  Negative
 0 11
April 29th, 2014  Negative
 0  5
May 8th, 2014  Negative
 0  3
May 27th, 2014  Negative
 1  12
June 3rd, 2014  Negative
 1  11
June 9th, 2014  Negative
 0  2
June 16th, 2014  Negative
 0 10
July 1st, 2014  Negative
 1  8
July 10th, 2014  Negative
5 13
July 16th, 2014 Negative
9 15
July 22nd, 2014 Negative 6 5
July 29th, 2014 Negative 35 4
August 6th, 2014 Negative 81 12
August 13th, 2014 Negative 151 13
August 19th, 2014 Positive 57 8
August 27th, 2014 Positive 76 9
September 3rd, 2014 Positive 36 13
September 10th, 2014 Positive 138

Trap Locations
The City uses six traps to conduct mosquito surveillance. Five of these traps remain in static locations throughout the year, while one trap roams across the City based on complaints or concerns. By keeping the majority of our traps in a static location, we are able to better track the spread of West Nile Virus across the City. For more information and a map on where sampling has been conducted, visit the Tarrant County Public Health WNV Surveillance map