Item 26 - Adoption of the City of Santa Ana Emergency Operations Plan

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City of Santa Ana Emergency Operations Plan Part I Basic Plan The area in Orange County with the highest risk of WNV, which includes the City of Santa Ana, is seen in the map below. Because WNV is a disease of birds, a bird die -off could indicate increased risk to residents. For this reason, the District maintains a dead bird surveillance program where dead birds can be reported to the District for testing. In response to the super epidemic of WNV in 2014 and 2015, the District expanded the adult mosquito control program to include the use of spraying from backpacks, trucks, and airplanes to control infected, adult mosquitoes in Orange County. Figure 92 West Nile Virus Hotspots WNV "Hot Spot" areas were selected from the 5 significant variables (: 85% Saint Louis Encephalitis (SLE) was the first (1933) recognized neuro-invasive arbovirus in the United States. Sporadic human cases have been diagnosed in southern California, and the virus and antibodies have been recovered from wild birds during surveillance studies. In 2015, SLE was detected in mosquitoes in Riverside County. The most recent, large-scale outbreaks of SLE occurred in southern California in 1983-1984 (26 cases, five in Orange County), the San Joaquin Valley in 1989 (29 cases), with sporadic cases reported in the Los Angeles Basin from 1990 to 1997. SLE virus activity has not been detected in Orange County following the introduction of WNV into the County in late 2003. Invasive Aedes Diseases include Chikungunya, Dengue, Zika, and Yellow Fever Viruses. In 2015, invasive Aedes mosquitoes (Aedes aegypti and Aedes albopictus) were detected infesting multiple neighborhoods in Orange County. Before the 2015 detections, Aedes aegypti had never been collected in Orange County and Aedes albopictus had not been detected since 2004 when it was considered eradicated from Orange County. As of 2016, the invasive Aedes mosquito species were detected in multiple neighborhoods of Orange County. The detection of the invasive Aedes mosquitoes indicates that disease transmission of chikungunya, dengue, Zika and/or yellow fever is possible in Orange County. 92