determining the MICs among extensively drug-resistant Gram-negative bacilli. Methods A
collection of 320 clinical isolates (n= 80 of each) of Escherichia coli, Klebsiella pneumoniae,
Pseudomonas aeruginosa and Acinetobacter baumannii from Sweden, Spain, Italy and the
Netherlands were tested. The MICs were determined using the IMC device calScreener
(Symcel, Stockholm, Sweden) and ISO-broth microdilution as the reference method …