Controls
Vector Index Areas
District-Wide MLE Trend
District-Wide MIR Trend
Abundance by Area Over Time
Vector Index by Area Over Time
Area Data Table
Data Sources & Methods
About This Dashboard
This dashboard displays mosquito surveillance metrics aggregated by Vector Index Area (VI Area) — geographic zones used for surveillance analysis across the MMCD district.
Data Sources
- Abundance: dbadult_mon_nt_co2_forvectorabundance — Monday night CO2 trap counts by species, location, and week.
- MLE: dbvirus_mle_yrwk_area / dbvirus_mle_yrwk_area_spp — Pre-calculated Maximum Likelihood Estimates of infection rate.
- MIR: dbvirus_mir_yrwk_area / dbvirus_mir_yrwk_area_spp — Pre-calculated Minimum Infection Rates.
- Geometry: loc_vectorindexareas_sections_a — Section polygons dissolved into 12 VI areas.
Metrics
Abundance (N)
Average mosquitoes per trap per night for the selected week and species.
N = Total Count / Number of Traps
MLE (Maximum Likelihood Estimate)
Statistical estimate of the probability a single mosquito is infected, calculated from pooled testing data using bias-reduced methods.
Pre-calculated in the database using the Firth method (bias-reduced MLE).
MIR (Minimum Infection Rate)
Simple proportion: (positive pools / total mosquitoes tested) × 1000
MIR = (Positives / Total Mosquitoes) × 1000
Vector Index (VI = N × P)
Combined measure of mosquito abundance and infection risk.
VI = N × P
Where N = average mosquitoes/trap, P = infection rate (MLE or MIR/1000)
Species
- Total Cx Vectors: Sum of all Culex species — uses area-level MLE (all species pooled together).
- Cx. pipiens (33): Primary WNV vector in urban areas.
- Cx. restuans (34): Early-season WNV vector.
- Cx. tarsalis (36): Efficient WNV vector, more rural.
- Cx. restuans/pipiens (372): Unresolved Culex identification.
Temporal Resolution
Data is organized by epiweek (yrwk) — epidemiological weeks. Each yrwk value encodes year and week number (e.g., 202537 = year 2025, week 37).