This function translates seven days of daily entomological inoculation rate (dEIR) into a multiday attack rate. The daily FoI is the sum of two terms: 1) a function F_foi computes the local dFoI; 2) a function travel_eir and traveling exposure while traveling.
# S3 method for class 'multiday'
Exposure(t, y, pars)the function modifies pars and returns it: the computed FoI are stored as pars$FoI