It was quite common that the opportunistic pathogens participated in mixed infection. The mixed infections from verdigris pseudomonas, Escherichia coli and other pathogens were 50.64 % and 25.87 %, suggesting that the types of infections were changing.

• 条件致病菌参与混合感染较为普遍 ；铜绿假单胞菌、大肠埃希氏菌与其他菌种混合感染占 5 0 .；6 4%25和 2 5