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. 2016 Jun;22(6):1008–1013. doi: 10.3201/eid2206.160045

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Laser particle measurements in cardiac operating room tested for transmission of Mycobacterium chimaera during surgery despite an ultraclean air ventilation system. Shown are measurements over time regarding heater–cooler unit (HCU) operational status (Off/On) and orientation (toward/away) with respect to the operating table. Lines indicate particle size ranges (in micrograms) captured by 6 gates and total particle count of the laser particle counter. Reconfig, time to reconfigure HCU status.