You have identified a concern I have. Mosquito control trucks and airplanes were a rare event prior to the West Nile virus, now it is common place in our population centers.
Either planes or trucks used in a biological weapons attack could easily pass as a mosquito control operation. Just as an airborne weapon of mass destruction flying down the Hudson River could pass as a passenger jet.
I wasn't expressing any concern or fear of the mosquito control trucks and airplanes...I was writing that the spraying has been very effective.
As far as this virus goes...at first it was probably under-reported. Now, there is some speculation that it might spread through blood transfusions and organ transplants.
This isn't terrorism. Just don't let mosquitoes bite you. And if you see pools of stagnent water, or old tires and rusty things, clean it up.