1 Infection Control Team, Queen Mary Hospital, Hong Kong West Cluster, Hong Kong Special Administrative Region, China.
2 Department of Microbiology, Queen Mary Hospital, Hong Kong Special Administrative Region, China.
3 Infection Control Team, Queen Mary Hospital, Hong Kong West Cluster, Hong Kong Special Administrative Region, China; Department of Microbiology, Queen Mary Hospital, Hong Kong Special Administrative Region, China. Electronic address: vcccheng@hku.hk.