the combination of therapeutically achievable concentrations of polymyxin b ( range 5 to 1.25 mug/ml ) and fresh , but not heat-inactivated human serum was found to exert an accelerated , additive effect against 9 of 10 'delayed serum-sensitive ' isolates of s. marcescens , an organism that is characterized by intrinsic resistance against polymyxins .
C0032535
polymyxin b
C0032539
polymyxins