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Antimicrobial susceptibility testing results for Staphylococcus aureus and Pseudomonas aeruginosa, World Health Organization and National Institute for Communicable Diseases external quality assessment programme for national public health laboratories, 2011–2016 (n = number of responding laboratories). The poor performance in 2015 was due to misinterpretation of the clindamycin D zone for S. aureus.
