The qualiWed presumption of safety concept of microorganisms
in food and feed. The qualiWed presumption of
safety (QPS) approach of micro-organisms in food and
feed (EFSA, 2005b) is a system similar in concept and
purpose to the generally recognised as safe (GRAS) deWnition
used in the USA, but modiWed to take account of
the diVerent regulatory practices in Europe. QPS provides
a mechanism to recognise and give weight to prior
knowledge when assessing the safety of micro-organisms