“ABSTRACT In vitro activity of the aminoglycoside … [AAC(6′)-Ib] was inhibited by ZnCl2 with a 50% inhibitory concentration (IC50) of 15 μM. Growth of … harboring aac(6′)-Ib in cultures containing 8 μg/ml amikacin was significantly inhibited by the addition of … complex with the ionophore pyrithione (ZnPT).”