more... > Insects and Relatives > Public Health > Pool pests [Image: Backswimmer] Insect problems in swimming pools and solutions for getting rid of them. Phoridae: Humpbacked Or Coffin Flies [Image: Phorid fly adults] Information on Phorid flies creating problems in hurricane damaged areas. They feed on and develop in decaying vegetable and animal material. What is West Nile Virus? West Nile virus is a mosquito-borne disease that can cause encephalitis, or a brain infection. Mosquitoes acquire the virus from birds and pass it on to other birds, animals and people.