In the simple MOI (queueing) model here (M/M/inf), net infectiousness is considered not to vary with increasing MOI. It is calculated as $$c \cdot (1 - \frac{X_{0}}{H})$$ where \(X_{0}\) is the number of uninfected persons (multiplicity of infection of zero).
# S3 method for MOI
compute_x(model)a vector of length n giving the net infectiousness of human hosts in each stratum
an object from make_MicroMoB