A dataset of PCR-tested mosquito pools used to summarize infection for female *Culex pipiens* in the Sacramento Metropolitan Area (Sacramento, Placer, El Dorado counties, California, USA). Each row represents a tested pool at a specific location and date, with an estimated pool size.
data(infect_sma)A data frame with one row per tested pool (for a total of 596 pools) and 5 variables:
Numeric. Longitude in decimal degrees (WGS84).
Numeric. Latitude in decimal degrees (WGS84).
Integer. Estimated number of mosquitoes in the pool (see Details).
Logical. Whether the pool tested positive for West Nile virus (TRUE/FALSE).
Date. Pool collection date (local).
Derived from the vectorsurvR sample datasets by:
Filtering to female Culex pipiens pools with WNV testing within the SMA using point-in-polygon against the union of Sacramento, Placer, and El Dorado counties.
Estimating pool size est_pool_n for each pool by:
Summing total female counts from nearby collection points within the same week and within a spatial radius (e.g., 2 km) to obtain \(T_{\mathrm{near}}\).
Counting nearby pools within the same week/radius to obtain \(m_{\mathrm{near}}\).
Setting est_pool_n = round(max(1, T_near / m_near)); if no nearby collections are found,
a conservative fallback (default 25) is used.
Coordinates are kept as WGS84 (EPSG:4326).
Important: est_pool_n is an estimate for demonstration and pooled-modelling
examples; it is not the recorded laboratory pool size.