Incorporating model uncertainties along with data uncertainties in microbial risk assessment

Much research on food safety has been conducted since the National Food Saf ety Initiative of 1997. Risk assessment plays an important role in food saf ety practices and programs, and various dose-response models for estimating microbial risks have been investigated. Several dose-response models can p rovide reasonably good fits to the data in the experimental dose range, but yield risk estimates that differ by orders of magnitude in the low-dose ra nge. Hence, model uncertainty can be just important as data uncertainty (ex perimental variation) in risk assessment. Although it is common in risk ass essment to account for data uncertainty, it is uncommon to account for mode l uncertainties. In this paper we incorporate data uncertainties with confi dence limits and model uncertainties with a weighted average of an estimate from each of various models. A numerical tool to compute the maximum likel ihood estimates and confidence limits is addressed. The proposed method for incorporating model uncertainties is illustrated with real data sets. (C) 2000 Academic Press.