Table 1. Pseudomonas aeruginosa isolates obtained from hospitals in Zhejiang Province, China, 2015–2017.

Year	No. hospitals*					No. isolates	Isolation rate, %†	Gram-negative isolates, %	Imipenem-resistant isolates, %
	Total	3A	3B	2A	2B
2015	78	41	23	13	1	22,464	8.1	11.9	35.4
2016	88	44	23	19	2	24,303	8.0	12.0	37.1
2017	84	41	24	18	1	25,113	7.8	12.0	39.1
*Hospital classification is performed by the National Health Commission of China on the basis of the number of beds and comprehensive evaluation scores. Comprehensive evaluation covers the number of departments, staffing levels, management, technical level, work quality, and supporting facilities. Class 3 hospitals have >500 beds, class 2 hospitals have 100–499 beds. Grade levels are given on the basis of scores from a comprehensive evaluation; grade A hospitals received >900 points, grade B hospitals received 750–899 points. †P. aeruginosa was the fourth most commonly isolated pathogen in the region in each of the reported years.