Results Among 31 cases,29 strains were Gram-negative bacteria(93%),including 14 strains of bacillus canalis capsulatus and 10 strains of bacterium levans.

• 结果31例菌株中，革兰氏阴性杆菌29株(93.；5%25)，其中肺炎克雷伯氏杆菌14株，硝酸盐阴性杆菌10株。