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Mosquito Control Update: Zika Preparedness Christopher Hunter, MD, PhD

Learn about the Zika virus, Aedes mosquitoes, and the response plans of Orange County Mosquito Control. Discover control techniques, the county's response to Zika cases, and future control strategies.

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Mosquito Control Update: Zika Preparedness Christopher Hunter, MD, PhD

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  1. Mosquito Control Update: Zika Preparedness Christopher Hunter, MD, PhD Director, Health Services Department 1

  2. Presentation Overview • Zika Virus • AedesAegyptiand AedesAlbopictus • Orange County Mosquito Control • Response Plans 2

  3. Zika Virus • Flavivirus • Transmission • The bite of an infected mosquito (Main Source) • Maternal-fetal transmission • Sex • Blood transfusion • Organ transplant • Laboratory exposure

  4. Zika Virus

  5. Zika Virus • Clinical Presentation • Usually mild (80% asymptomatic) • Rash, fever, arthralgia, conjunctivitis • Recently linked to microcephaly, fetal demise, and Guillian-Barre Syndrome • Symptoms occur 2-12 days after infection, resolve in 7-10 days • Blood or urine tests required for confirmation • No treatment or vaccine available Main source of protection is to limit exposure

  6. Zika Virus

  7. Zika Virus • Local Transmission • Miami-Dade County • 4 original cases • 24 additional • 1 sq mile • CDC Team activated • First travel warning from within continental USA

  8. Aedes aegypti Aedes albopictus Mosquito Vectors • Adapted to urban environments • Day-time biters • Difficult to control

  9. Breeding Habitats • Seek out standing water in containers • Can grow from eggs to mature (biting) adults in 7 days during summer months

  10. Mosquito Vectors 150 yards

  11. Distribution of Aedes Mosquitos

  12. Mosquito Control Division • Kelly Deutsch – Acting Manager • 30 positions • Addition of 10 seasonal 2016 • Total Budget - 2.1 M • Operating expenses .5 M • 18 vehicles

  13. Mosquito Control Division • Surveillance and Abatement programs • Scheduled and unscheduled site visits • Trap and identify adults and larvae • Destroy breeding habitats and use adulticides and larvacides • Collaborate with Department of Health for target sites and viral testing

  14. Control Techniques • Surveillance • Trap and identify larvae or adult mosquitos

  15. Control Techniques • Removal of standing water • Barrier protection • Repellents (DEET) • Clothing • Screens Requires manpower and public engagement

  16. Control Techniques • Larvacide/adulticide • Timing is important • Ultra Low Volume • Less effective for Aedes species

  17. Orange County Zika Response • The presence of Zika virus can be detected in blood or urine samples • The Department of Health (DOH) requires mandatory reporting when these tests are run • The DOH notifies Orange County Mosquito Control and investigates those tested to evaluate for travel history and other sick contacts

  18. Orange County Zika Response • For every SUSPECTED case • Given map coordinates by DOH • Crews perform surveillance within 220 yards of property • Removal of breeding habitats • Set traps • Locally spray adulticide • Leave door hangers • Return in 24 hours • If traps have aedes mosquitos, repeat the above

  19. Orange County Zika Response Test Mosquitos Complete

  20. Orange County Zika Cases • Suspected Cases (test sent for results): 409 • Number of properties visited: 9,750 • Confirmed cases (total): 52 • Confirmed local transmission cases: 0 • Mosquitos tested: 95 vials with 1,495 total • Mosquitos positive for Zika: 0 Total additional state and federal funding: $124,246

  21. Orange County Zika Response • Proactive Communication • Mosquito Control has been featured in dozens of media reports since this winter • Orange County website has links to education and PSAs regarding Zika • Social media outreach has been consistent • Engagement with Community • Education to CFHLA, regional lawn care businesses, EMS, GOAA, OCPS, • Engagement with Staff • Collaboration with HR, Dept Directors, and Managers

  22. Response Plan for Local Transmission

  23. Response Plan for Local Transmission • Orange County Mosquito Control • Increase Surveillance (door-to-door, traps) • Utilize Citizen Emergency Response Teams, HOA volunteers, and Medical Reserve Corps for manpower • Department of Health • Test sero-prevalence among contacts of positive cases • Provide access to private property • Coordinate with mosquito control • Orange County Communications • Organize press releases, PSAs, and media events to encourage community action • Coordinate messaging with partners in tourism, schools, etc.

  24. Response Plan for Local Transmission • Challenges • Addressing emergent area while maintaining normal mosquito control operations • Minimizing the potential economic impact by empowering our business partners to join the mitigation effort • Ensuring our message is reaching all Orange County residents • Collaborating with the entire Central Florida region

  25. Low Likelihood of a Major Outbreak • Screens • Air Conditioning • Insect repellent • Robust Mosquito Control operation • Synchronized Public Health agencies • Access to OBGYN care

  26. Future Control Techniques The future of Mosquito Control?

  27. Mosquito Control Update: Zika Preparedness Christopher Hunter, MD, PhD Director, Health Services Department 1

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