I am not an entomologist, but my background is Microbiology. Without boring you with the details everything living has a life cycle. To destroy it, you must interrupt this cycle. There are microscopic organisms at the base of your eyelashes. Your entire digestive tract has a "flora and fauna" (plant and animal) existing in it. (Most of your fecal matter is bacteria). You are covered with microscopic bacteria that feeds on your dead skin. If you don't beleive me, try not washing for a while. That smell is the organisms enjoying a larger and larger feast. (or just get a good wiff of something that has been dead for a while). Many of these organisms help you, Some obviously hurt or can even destroy you. Here's an example, the organism that is the cause of tuberculosis (Mycobacterium tuberculosis)(highly contageous), exists quite happily in your lungs, as most organisms like warm and moist. When it's time to spread the infection the organisms develope in pockets in the back of the infected host's throat, so when they cough, to "clear your throat" , they discharge the organism into the air hopefully (if your a bacteria) to be breathed in by another host. It's really no different in many cases for insects. These parasites are enjoying life at the expense of another with what appears to be no deleterious side effect (other than the mental trauma). First, the entemologist must find what specie/s it is that we are dealing with here. Then it's life cycle must be studied. For example, Does it travel through the bloodstream like viruses.? Next we must try to find a convenient way to "interrupt" the cycle with out destroying the host. I recently visited the outer banks of N. Carolina. An old mosquito bite on my foot, I had scratched, had begun to scab over, but the tissue was still soft. It was then, that I noticed tiny gnats flying to that very spot of my foot. They would walk around the top of my foot until they found this soft tissue area and would congregate there. I'm sure there was a reason for this, maybe to lay eggs? Just like the flys that lay eggs in any road kill or dead animal, it's part of their life cycle. Anyway, all of this is not for shock value, just to say that you have a very powerful immune system to combat all of this. But, we do things to ourselves to weaken this system. Poor diet, smoke, pharmacueticals, etc. Anything that weakens your immune system, may leave you vulnerable to attack. Normally when an insect trys to invade, a boil or pimple will encapsulate it for discharge out of the body. Why these particular organisms resist this mechanism in these particular cases is where I need more information and can offer nothing more. Maybe I should start an "immune support" thread. Anyway, for those that managed to read this entire post, I hope it helped a little. If anybody wants to continue this line of discussion, or have a question about anything I wrote, feel free to ask.......... " The meek shall inherit the earth"