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Increased incidence of community‐associated Staphylococcus aureus bloodstream infections in Victoria and Western Australia, 2011–2016

During calendar years 2016 and 2017, the Victorian Healthcare Associated Infection Surveillance System (VICNISS) and Healthcare Infection Surveillance Western Australia (HISWA) received reports from affiliated hospitals about increases in the frequency of CASABs. We sought to formally review trends in their incidence and to determine whether populations at particular risk could be identified. We analysed quarterly data for the period 1 January 2011 – 31 December 2016 from 93 Victorian public hospitals (VICNISS) and 58 Western Australian public hospitals (HISWA). As a quality assurance evaluation of surveillance data, no patientidentifying or hospitallevel data were captured; formal ethics review was therefore not required.