TABLE 2.

A. baumannii time-kill assay responses of isolates against which drug combinations were synergistic by the checkerboard method

Combination and isolate	24-h log killinga	Regrowth	24-h synergy
Minocycline-colistin
12	−6.1	No	No
30	−5.9	No	Yes
31	−5.5	No	Yes
34	−6	No	Yes
40	−6	No	Yes
Tigecycline-amikacin
18	2.1	No	No
31	0.5	No	No
Minocycline-amikacin, 17	−1.1	Yes	Yes
Minocycline-doripenem
17	−2.6	No	No
52	−1.1	No	Yes
Doripenem-tigecycline
17	−2.1	No	Yes
31	0.1	No	No
53	1.4	No	No
Doripenem-colistin
24	−5.9	No	Yes
31	−3.9	No	No
33	−1.2	No	No
69	−1.4	No	Yes
Doripenem-colistin-minocycline
2	−1.3	No	No
8	−0.8	No	No
12	−3.3	No	Yes
24	−6.1	No	Yes
28	−0.9	No	Yes
Doripenem-colistin-tigecycline
12	−0.3	No	No
69	−5.7	No	Yes

^aBold values indicate a bactericidal effect.