Table 1.

Minimal inhibitory concentrations effective for ≥50% and ≥90% of isolates tested (MIC₅₀ and MIC₉₀) of colloidal silver for Gram-negative and Gram-positive bacteria.

Pathogen	N	MIC50 (mg/L)	MIC90 (mg/L)
Gram-negative Acinetobacter baumannii	45	4	4
Pseudomonas aeruginosa	25	2	4
Escherichia coli	79	2	8
Klebsiella pneumoniae	58	8	8
Gram-positive
Staphylococcus aureus	34	4	8
S. epidermidis	14	4	4
Enterococcus spp.	15	4	4