CONCLUSION: The zymogenic rates of main enterobacteriaceae bacteria are higher than those of non ferment bacteria. Nearly 20.0% of bacteria produced AmpC, to which intensive attention should be paid clinically. 结论:主要肠杆菌科细菌的产酶率高于非发酵菌,产AmpC酶的菌株已近20.0%,应引起临床的高度重视;