FIG. 1.

Temporal patterns of Culex spp. mosquito abundance and infection rates per 1000 female mosquitoes from late May to mid-October at study sites with nest boxes (1, 5, 7, 11, EC, SC, HS, WW) in southwest suburban Chicago, Illinois, 2006 and 2007. Vertical bars indicate seasonal distribution of nestling blood samples collected during each year. Weeks used are defined by the Centers for Disease Control for use in the Mortality and Morbidity Weekly Report.