Foodborne Outbreak Investigation: Effect of Recall Inaccuracies on Food Histories

Abstract

Comparably low accuracy of dietary recall is present after 7 and 18 days. Experiencing gastrointestinal symptoms did not affect accuracy of dietary recall. Repeatedly recalling food exposures leads to a higher rate of false positives. Prevalence of exposure was associated with higher sensitivity and lower specificity. Recall inaccuracies can be quantified and accounted for in public health practice.

Keywords: Food history questionnaire; Foodborne illness; Investigation strategy; Outbreak investigation; Recall bias; Recall inaccuracies.