Mosquito season is in full swing in the Berkshires and its been a pesky one. Three have already tested positive for West Nile virus with two just last week. YNN's Brandon Walker spent time with county mosquito control officers as they worked to beat the bugs.

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PITTSFIELD, M.A. -- Counting mosquito larva is the name, killing off any prospect of West Nile Virus is the game.

"Check the catch basin, see if there's any water in it," said Dan Salla as he dropped packets of mosquito repellent into catch basins.

This year seems busier for Salla, who works for the Berkshire County Mosquito Task Force. The group is ramping up treatments, after two mosquitos last week tested positive for West Nile in the county. That follows one earlier this summer in Pittsfield, bringing the total number of infected mosquitos tested thus far in the city to two.

"We've been able to keep up to date on the larva sighting, like a seven to ten day interval," said Chris Horton, superintendent, Berkshire Mosquito Task Force.

Horton said they're keeping breeding down with the help of new technology like a GPS tracking device and sprinkling water puddles with a corn-treated larvacide.

Despite this, mosquitos have tested positive sooner this year than last.

Horton said he isn't sure if the virus is more potent this year, or if a lack of stagnant water has mosquitos laying eggs in fewer locations, increasing infection rates.

"We're doing a little more trapping at the locations where we had positives, ramping up our public outreach which tells people to be aware of mosquitos and to avoid mosquito interactions," said Horton.

To do that, keep repellent handy and try to stay inside at dawn and dusk. Samples collected this week have been sent to Boston for testing. Results should be in Friday.