The gram negative bacilli is reveraled predominance of E coli,E cloacae,K pneumoniae,pseudomonas aeruginosa and acinetobacter.

• 革兰氏阴性杆菌以大肠艾希氏菌、阴沟肠杆菌、肺炎克雷伯氏菌、铜绿假单胞菌和不动杆菌为主。