To calculate the overall probability of infection,
the probability of infection from a contaminated
serving (from the dose–response relationship)
needs to be combined with the probability of
actually consuming a contaminated serving
(prevalence)
o Pinf (Probability of infection)=( Pinf per
serving)(prevalence)
! The consumption and dose calculations were based
on weekly aggregates. To estimate the annual risk, a
conservative assumption was taken that there was
no seasonality and there was exposure to an
equivalent risk over 52 weeks. The probability of
illness per year was calculated as: