PCRs on serial dilutions of template showed Cq (Cycle threshold) values ranging from 19.5-41.5 for single PCRs, and Cq values of 20.2-46.3 for multiplex reactions. The mean difference in Cq value between single and multiplex reactions was 0.9, with a tendency towards an increased difference with decreasing template concentrations. Mixing of templates did not affect Cq values. The lower limit of detection was approximately 10 colony forming units. The amplification efficiencies in multiplex format ranged from 85% for VIM to 82% for IMP (Figure 1). We concluded that the PCRs were compatible.