Exposure

The EIR computed by xds_info_transmission is a measure of local risk: it is the expected number of infected bites, per person, and it is computed for every population stratum. In exposure, the daily local EIR is computed into a measure of the population FoI in three steps:

• the total EIR is the weighted sum of local exposure and travel exposure, using the concept of time here vs. time away;

• the distribution of the number of bites per person is computed under a model of environmental heterogeneity ;

• the number of infections is computed under a model of partial immunity.

Environmental Heterogeneity

While EIR is an expected value, the expected value can have a distribution in a human population stratum. For example, if the expectation has a Gamma distribution, then the expected number of bites per person would be negatively binomially distributed. For more, see xds_info_environmental_heterogeneity.

Travel Malaria

Travel malaria is defined by exposure to malaria while spending time outside of the spatial domain represented by the patches. See xds_info_travel_malaria

Pre-Erythrocytic Immunity

Depending on the X module, a parameter called \(b\) describes the probability of infection per infectious bite.

See also

xds_info_environmental_heterogeneity | xds_info_travel_malaria