13.09.2023

Cefiderocol susceptibility testing - an update

This is to inform all EUCAST users that the evaluation of cefiderocol susceptibility testing methods is being taken very seriously by EUCAST and still on-going. Our aim is to have a modified recommendation available on the website before the end of this year, hopefully already in October/November.

Until then, the WARNING is still valid, which means that the commercially available gradient test and other tests still have problems being looked into.

As part of the warning, there are caveats related to the disk diffusion test. The EUCAST recommendation still holds true provided the caveats related to the choice of media and disks are respected. There is increasing evidence that cefiderocol ATUs can be narrowed in October/November.