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Weekly numbers of Jamestown Canyon virus isolations and infection rates (IR) relative to the mean number per trap-night of Aedes vexans, Culex tarsalis, Culiseta inornata, Ochlerotatus dorsalis, Ochlerotatus flavescens, Ochlerotatus melanimon, Ochlerotatus sticticus, and Ochlerotatus trivittatus, North Dakota, 2003–2006.
