Isolate PFGE type/(isolate number) International clonal lineage Susceptible to phage in sediment OXA-23 clone 1 (1) 2 II No North West strain (1) 3 II Yes South East clone (1) 2 II Yes Burns Unit strain (1) 2 I No a) Original four isolates grown in presence of sediment: PFGE type1 International clonal lineage Proportion of representatives tested susceptible to bacteriophage South East clone4 II 8/9 North West strain3 II 1/2 OXA-23 clone 12 II 0/8 T-strain II 0/1 SAC-1 II 0/2 QAC-92 II 0/1 WM (Australia 2)2 II 1/1 Other strains II 0/2 QAC-162 I 0/1 AYE strain I 0/1 Burns Unit strain2 I 0/2 QAC-242 I 0/1 CAC-92 I 0/1 Midlands 2 III 0/1 Sporadic strains - 0/3 b) Testing panel for enriched bacteriophage suspensions5 1 PFGE types are as described previously (15). 2 PCR positive for blaOXA-23-like acquired carbapenemase gene. 3 PCR positive for blaOXA-58-like acquired carbapenemase gene. 4 Two of the nine representatives of the South East clone tested were PCR positive for blaOXA-23-like acquired carbapenemase gene. 5 Suspensions all gave the same results

Table 1: A. baumannii isolates used.