From 14th November 2012, version 11.1 BSAC breakpoints (May 2012).
From 28th June 2011 to 14th November 2012, version 10.2 BSAC breakpoints (May 2011).
From 26th April 2011 to 28th June 2011, version 10 BSAC breakpoints (January 2011).
From 10th March 2010 to 26th April 2011, version 9 BSAC breakpoints (Jan 2010).
From 1st July 2009 to 10th March 2010, version 8 BSAC breakpoints (Jan 2009).
From 26th September 2008 to 1st July 2009, version 7.1 BSAC breakpoints (Feb 2008).
From 6th Feb 2007 to 26th Sept 2008, version 6.1 BSAC breakpoints (Feb 2007).
From 14th March 2006 to 6th Feb 2007, version 5 BSAC breakpoints (Jan 2006).
From January 2006 to 14th March 2006, version 4 BSAC breakpoints (Jan 2005).
At each time, some EUCAST breakpoints were used for a few combinations where BSAC breakpoints had not been set.
This site lists breakpoints only for antibiotic/organism combinations tested in the BSAC Resistance Surveillance Project; they were extracted from BSAC and EUCAST sources in Aug 2012. Recommendations may have changed since then. Please visit the BSAC or EUCAST websites for the most recent complete annotated tables.
The breakpoints used to classify isolates as susceptible/intemediate/resistant on this website are the version 11.1 BSAC breakpoints (May 2012), with a correction for Streptococci-oxa (S<=2). In a few cases, where BSAC breakpoints have not been set, EUCAST v 2.0 breakpoints (Jan 2012) are used (for S. pneumoniae with amp, cli, dor, min and tec; alpha-haemolytic streptococci with cxm, dor, ipm and mem; beta-haemolytic streptococci with lvx, min, mxf, rif and tec; enterococci with amc, amp, ipm and sxt; Acinetobacter with lvx and sxt; H. influenzae with dor, min and rif; and M. catarrhalis with ctx, dor ipm, mem and min).
More recent breakpoints may exist.
We aim to use current breakpoints on this website. As a result, the percentages of isolates shown as susceptible/intermediate/resistant may differ from those published in previous papers or calculated on the website at an earlier date with earlier breakpoints.