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Table 1 Colistin MICs and antimicrobial activity of biosurfactant extract ST34 (10.00 mg/mL) against a panel (n = 16) of MDR and XDR bacterial isolates

From: Exploring the antimicrobial resistance profiles of WHO critical priority list bacterial strains

OrganismStrain CodeSourceColistin MIC (mg/L)Antimicrobial inhibition zone diameter (mm) ± SD
Surfactin Extract
A. baumanniiAB 1ATCC2 (S)13.3 ± 1.2
AB 2Clinical2 (S)14.7 ± 0.6
AB 4Clinical>  4a (R)17.3 ± 0.6
AB 6Environmental2 (S)11.7 ± 1.2
E. coliEC 1ATCC4 (R)12.7 ± 0.6
EC 2Clinical2 (S)15.7 ± 0.6
EC 3Clinical>  4a (R)15.7 ± 1.6
EC 4Environmental4 (R)14 ± 0
EC 5Environmental4 (R)17.7 ± 0.6
K. pneumoniaeKP 1ATCC4 (R)14.3 ± 0.6
KP 4Clinical4 (R)13.3 ± 0.6
KP 5Environmental>  4a (R)13 ± 1
P. aeruginosaPA 1ATCC4 (R)13 ± 0
PA 2Clinical8 (R)13 ± 0
PA 3Clinical4 (R)13.3 ± 0.6
PA 4Environmental4 (R)12.7 ± 0.6
  1. aCorresponds to a colistin concentration exceeding 4 mg/L; S susceptible; R resistant