The present invention relates to methods of preventing or inhibiting the growth of Helicobacter through the use of a composition that comprises a glucosinolate, an isothiocyanate or a derivative or metabolite thereof. The DFPA is executed for an initially selected generation of subset quality metrics using quality metric values stored in a reference data base. Then during an aggregate phase, each vehicle responds in a predesignated way to an encounter with one of the other vehicles.