Results: Among 45 bacteria species producing AmpC, there were 19 Escherichia coli (42.2%), 6 Aeromonas hydrophilia (13.3%), 7 Hafnia alvei (15.6%), 5 Enterobacter cloacae (11.1%), 4 Klebsiella pneumoniae (8.9%), 1 Proteus mirabilis (2.2%), 1 Providencia rettgeri (2.2%), 2 Morganella morgani (4.4%).