Figure. Area of Camargue, France, showing locations of magpie capture sites: site A (n = 56, with 24 adults, 32 juveniles, and 0 nestlings), site B (n = 94, with 34 adults, 57 juveniles, and 3 nestlings), site C (n = 68, with 17 adults, 34 juveniles, and 17 nestlings), and site D (n = 53, with 1 adult, 52 juveniles, and 0 nestlings). Confirmed equine and avian cases infected with West Nile virus in 2004 are also indicated. Histograms correspond to site designations and indicate serologic titers (x-axes) measured by using a microneutralization test plotted against no. birds (y-axes).