Table 4.

Number of hospital outbreaks in 7 acute regional hospitals within the public hospital service network in Hong Kong between 2010 and 2014

	Queen Mary Hospital	Hospital A1, B1, C1, D1, E1, and F1	Overall results
Causative agent
Multiple-drug-resistant organisms∗	0	72	72
Respiratory viruses†	1	22	23
Gastroinestinal pathogens‡	0	22	22
Others§	0	2	2
Total number of outbreaks	1	118	119
Number of outbreaks per 1 million patient discharges	1.48||	5.66-58.85	24.26
Number of outbreaks per 1 million patient-days	0.45¶	1.72-16.07	6.70

^∗Includes vancomycin-resistant enterococci (57 outbreaks), multiple-drug-resistant Acinetobacter baumannii (9 outbreaks), methicillin-resistant Staphylococcus aureus in pediatric and neonatal wards (5 outbreaks), and carbapenem-resistant Enterobacteriaceae (1 outbreak).

^†Includes influenza A virus (13 outbreaks), respiratory syncytial virus (6 outbreaks), parainfluenza virus (2 outbreaks), influenza B virus (1 outbreak), and metapneumovirus (1 outbreak).

^‡Includes norovirus (13 outbreaks), rotavirus (6 outbreaks), and Clostridium difficile (3 outbreaks).

^§Includes scabies (1 outbreak) and Trichosporon asahii (1 outbreak).

^||The number of outbreaks per 1 million patient discharges in Queen Mary Hospital is 16 times lower than the overall results (rate ratio, 0.061; 95% confidence interval, 0.001-0.341; P < .001).

^¶The number of outbreak per 1 million patient-days in Queen Mary Hospital is 15 times lower than the overall results (rate ratio, 0.068; 95% confidence interval, 0.002-0.376; P < .001).