(A) Phage plaques with opaque haloes formed by phages APK2, APK32, APK37, APK44, APK48, APK87, APK89, and APK116 on A. baumannii ACICU (K2), LUH5549 (K32), NIPH146 (K37), NIPH70 (K44), NIPH615 (K48), LUH5547 (K87), LUH5552 (K89), and MAR303 (K116), respectively. (B) Phage APK2 spot titration from the top down (10-fold serial dilutions) on lawns of A. baumannii ACICU and B11911 after overnight incubation. (C) Spot test with serial 2-fold titration of purified recombinant depolymerase APK32_gp46 on A. baumannii LUH5549 lawn after 8 h of incubation.