Bacteriological Profile of Diabetic Foot Ulcer with Special Reference to Drug-resistant Strains in a Tertiary Care Center in North-East India

AIM This study was carried out to determine the bacteriological profile of infected diabetic foot ulcers (DFUs) and the antibiotic resistance pattern from the isolates. An attempt was made to suggest an empiric antibiotic regimen to treat such patients. MATERIALS AND METHODS Tissue samples were collected from 150 patients between February 2015 and January 2016 with DFUs under aseptic precautions and they were processed as per the Clinical and Laboratory Standards Institute guidelines. RESULTS A total of 185 bacterial isolates were obtained from 150 persons with diabetic and with foot ulcers. The age group of these persons ranged from 35 to 80 years and the maximum number of persons with DFUs was in the age group of 60-65 years. Among the isolates, Gram-negative bacilli were isolated in 112/185 (61%) and Gram-positive cocci in 73/185 (39%) cases. The most common isolate was Staphylococcus spp. 46 (25%), followed by Escherichia coli (20%) and Enterococcus spp. (15%). The antibiotic sensitivity profile of the bacteria was also studied. Among the isolates, 59/112 (53%) of the Gram-negative bacilli were extended spectrum beta-lactamase producers, 19/46 (41%) were methicillin-resistant Staphylococcus aureus, and 5/27 (19%) were vancomycin-resistant Enterococcus. CONCLUSIONS This study showed a preponderance of multidrug-resistant strains among the isolates from the DFUs. Knowledge on the antibiotic sensitivity pattern of the isolates will be helpful in determining the drugs for the empirical treatment of diabetic ulcers. Thus, indiscriminate use of antibiotics and chances of subsequent development of antibiotic resistance can also be reduced.