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Stacked area graphs showing weekly vector index for Culex tarsalis, Aedes vexans, and seven other species relative to weekly numbers of human cases diagnosed with West Nile virus infection 2003, 2004, 2005, 2006, and 2003–2006. The other species were Coquillettidia perturbans, Culiseta inornata, Ochlerotatus dorsalis, Ochlerotatus flavescens, Ochlerotatus spencerii, Ochlerotatus triseriatus, and Ochlerotatus trivittatus.
