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Aims: This investigation aimed to isolate enteric rods from subgingival sites of patients presenting chronic periodontitis lesions, and to assess antimicrobial resistance and expression of hydrolytic enzymes.

Methods and Results: Enterobacteriaceae were isolated from 20% patients, and assayed for antimicrobial susceptibility and hydrolytic enzymes with specificity to different substrates. Isolates comprised seven Enterobacter cloacae (43·75%), five Serratia marcescens (31·25%), one Klebsiella pneumoniae (6·25%), one Enterobacter aerogenes (6·25%), one Pantoea agglomerans (6·25%), and one Citrobacter freundii (6·25%). Gelatinase activity was observed for 75% strains; caseinase and elastase was produced by six and two strains, respectively. DNase, lecithinase and lipase were expressed by S. marcescens. Most of strains were resistant to ampicillin (93·75%) and amoxicillin/clavulanic …