Antibacterial effect of mango [mangifera indica Linn.] leaf extract against antibiotic sensitive and multi-drug resistant Salmonella typhi

ABSTRACT

Alternative herbal medicine has been used to treat various infections from centuries. Natural plants contain phytoconstituents having similar chemical properties as of synthetic antibiotics. Typhoid fever is a serious infection and failure of its treatment emerged multi-drug resistant [MDR] bugs of Salmonella typhi. Due to multiple and repeated issues with antibiotics efficacy, it became essential to evaluate biological properties of plants from different geographical origins. Mango leaves have been reported for various medicinal effects like antioxidant, antimicrobial, antihelminthic, antidiabetic and antiallergic etc. Objective of present study was to investigate anti-typhoid properties of acetone mango leaf extract [AMLE] against antibiotic sensitive and MDR S. typhi isolates. A total of 50 isolates of S. typhi including MDR [n=30] and antibiotic sensitive [n=20] were investigated. Staphylococcus aureus [ATCC 25923] and Salmonella typhimurium [ATCC14028] were used as quality control strains. AMLE was prepared and its antibacterial activity was evaluated by agar well diffusion screening method and minimum inhibitory concentration [MIC], by agar dilution technique. Zone of inhibition [mm] of AMLE against MDR and antibiotic sensitive isolates was 18 +/- 1.5mm [Mean +/- S.D]. Zone of S. aureus [ATCC 25923] and S. typhimurium [ATCC14028] was 20 +/- 1.5mm [Mean +/- S.D]. MIC of AMLE was reported in range from 10-50 mg/ml. The present study described the inhibitory effects of mango leaves against S. typhi