"It's a very simple thing."  

With a bucket, pipe, net and fan... health officials in Fort Worth hope a device will help protect people from the West Nile Virus.

"We are trying to avoid, reduce exposure to the West Nile Virus," says Dr. Joon Lee, University of North Texas Health Science Center:
More mosquitoes in the area are testing positive…  So Dr. Lee has installed dozens of traps to monitor the insects. Nationwide, nearly 40 people have contracted the virus. Symptoms include fever, headache, body aches, and fatigue. 

That occurs in about 20% of the people who get bitten by the infected mosquitoes, so everybody doesn't get sick....encephalitis, or this kind of paralytic illness, they can be long lasting," says Dr. William Schaffner, Vanderbilt University Medical Center.

Each week Dr. Lee and his team test about 1,500 mosquitoes. If a sample tests positive- the city is notified immediately 
"Within 24 hours we will be at ground zero going door-to-door talking to people on their doorstep to let them know we have had some positive West Nile mosquitoes," says Brandon Bennett of City of Fort Worth.

If  positive tests keep coming back, the city will spray to kill the mosquitoes.