A 2001 nationwide survey revealed that of urban insect pests, ants were rated highest in difficulty to control and number of calls received from homeowners. They were followed closely in this survey by subterranean termites, cockroaches, and pantry pests. People also experienced anxiety or fear of being bitten or stung by insects and their kin. Spiders are especially feared and the brown recluse spider is a notoriously venomous species that has been estimated to occur in over 80% of Missouri homes. Mosquitoes are an important biting insect, and since the arrival of West Nile Virus in 2000, there are yearly concerns about the impact of this mosquito-borne illness. Flies are a constant pest of food safety/sanitation and the number of bedbug infestations reported in North America has doubled annually since 1995.