Twelve strains were classified into Type A and B (B1,B2) according to PFGE pattern. Most of type A strains were isolated from intensive care unit (ICU).

• 12株PFGE图谱分为A、B(B1、B2 ) 2型 ,以A型为主要流行株 (9株 ) ,主要集中在重症监护病房 (ICU)。