PO13 | A BAYESIAN APPROACH TO LISTERIA MONOCYTOGENES RISK ASSESSMENT AND SAMPLING PLAN OPTIMIZATION IN OFFICIAL CONTROLS: Giuliana Blasi1, Cesare Ciccarelli2, Guglielmo D’Aurizio3, Annalisa Petruzzelli1, Donatella Ottaviani1, Francesca Leoni1, Francesca Barchiesi1, Elena Rocchegiani1 | 1Istituto Zooprofilattico Dell’Umbria E Delle Marche “Togo Rosati” (IZSUM), Italy; 2Azienda Sanitaria Territoriale Ascoli Piceno, Italy; 3Agenzia Regionale Sanitaria Marche, Italy. Ital J Food Safety 2026, 15 (s1). https://doi.org/10.4081/ijfs.2026.16241.