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Background  Multi-drug resistance in microorganisms is a serious problem at national as well as at a global level. Many researches have suggested alternatives to antibiotics with minimal or no major side effects. LAB is one of the most human-friendly probiotic strains known to mankind from times immemorial. With the objective to deal with progressing antibiotic resistance among microorganisms, the present work demonstrates the inhibitory activity of LAB consortium against MDR clinical isolates.    Methods  Total of nine hospital isolates of staphylococci were obtained and distinguished as  S.aureus  and coagulase-negative  Staphylococcus  (CoNS) based on their ability to ferment mannitol and form clumping with citrated plasma. All the test organisms were tested for antibiotic sensitivity with HiMedia (India) Octadisc Combi 92. Sets of  L .plantarum ,  L .acidophilus  and  L.casei var. rhamnosus  were prepared and tested against a standard culture of  S.aureus  NCIM 2129 by agar well diffusion method. To identify the primary source of substances responsible for inhibitory action, whole broth, cell-free supernatant, and cell lysate was prepared from the above-mentioned set. These were tested for their inhibitory action initially against standard  S.aureus  NCIM 2127, followed by clinical isolates.    Results  The antibiotic sensitivity profile revealed that all clinical isolates were multi-drug resistant. The maximum inhibitory potential was seen in a combination of the three LAB in the ratio 1:1:1. Highest antagonistic activity was observed with whole broth and cell lysate of LAB consortium. In liquid broth assay, the cell lysate of LAB consortium astoundingly exhibited up to 85% inhibition of multi-drug resistant  Staphylococcus  isolates.    Conclusions  Our results suggest antagonistic role of LAB metabolites against methicillin resistant staphylococci.

Invitro synergistic activity of lactic acid bacteria against multi-drug resistant staphylococci