With cases of West Nile Virus and other mosquito-transmitted viruses such as Chikungunya (87 confirmed travel-associated cases in Florida in 2014, as of July 19.) cropping up in the U.S. and our area, I was proactive in helping when visiting my daughter in rural Baltimore, MD and encountering alot of flying insects. My daughter has a huge, covered back porch that runs the length of the house and a smaller one in front. There is a lot of foliage surrounding the house and bugs, particularly biting ones, tend to be bothersome. The porch is not screened in, so I bought bug zapper to see if it would help and it does!