Fig. 2.
Culex WNV indices and human cases within the outbreak area, May 23–July 31. 2a: Culex IR (positive mosquitoes per 1000 tested) and human cases in the outbreak area. Solid line: combined Culex IR; dashed line: Cx. quinquefasciatus IR; dotted line: Cx. tarsalis IR. 2b: Culex VI (estimate of WNV-infected mosquitoes collected per trap night) and human cases in the outbreak area. Solid line: combined Culex VI; dashed line: Cx. quinquefasciatus VI; dotted line: Cx. tarsalis VI.