Objective Food tracing means collecting information through the food chain from production to consumption,either backward or forward,helping to identify the source and distribution of suspected foods in foodborne disease outbreaks.An outbreak caused by Enterohemorrhagic Escherichia.Coli O104:H4 infection has happened during May to July in 2011 in Germany.With the help of food tracing investigation system,the source,fenugreek seeds imported from Egypt,was eventually identified.This article gives ...