“…In the past, several methods have been used to differentiate strains of Proteus. These methods include serological typing (17,20,21), biochemical characterization (8,10,27), antibiotic susceptibility patterns (5,9,10), the Dienes reaction (2,7,22,24), bacteriocin typing (6), and bacteriophage typing (10,16,18). Previous bacteriophage typing systems have not been sensitive enough, but most investigators concluded that additional research on a basic set of typing phages would improve sensitivity and result in a useful system.…”