In ramp.xds exposure to infective bites
is handled in several steps:
The number of infective bites, per patch, is computed by a function
F_fqZ.These bites are allocated to the local human population strata and to visitors according to their availability, which returns the daily
EIRas a vector. WhereasF_fqzis a vector of length \(n_p\) ornPatches,the EIR is a vector of length \(n_h\) ornStrata.Total exposure is transformed into a measure of the local FoI or AR under a model of environmental heterogeneity.
A separate model estimates the travel FoI or AR.
The total FoI is the sum of expected time spent traveling.