In order to determine breakpoints, the EUCAST Break-
points Subcommittee requires information from those pro-
moting the antimicrobial agent. In the pursuit of international
collaboration, we have, whenever possible, used the wording
of a version of the NCCLS document M23 whichwas the sub-
ject of discussion at the time the EUCASTdocument was pro-
duced. The wording of this EUCASTdocument di¡ers from
that of the published versions of M23 and cannot be used as a
substitute when it is intended to follow NCCLS guidelines.
Rather, its purpose is to facilitate the provision of documenta-
tion required of those seeking a breakpoint determination in
Europe.