Simple colorimetric microplate test of phage lysis in Salmonella enterica

A simple microplate method, based on conversion of tetrazolium to formazan, was devised for rapidly assessing Salmonella survival after phage treatment. Results were easily interpretable.Monitoring with a microplate reader was useful, but not required. The method was used in defining phage–Salmonella interactions for selection of phage biocontrol cocktails.