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In the present study, the in vitro inhibitory effects of G. glabra extract against the growth of Salmonella typhi, S. paratyphi B, Shigella sonnei, S. flexneri and enterotoxigenic E. coli (ETEC E. coli) was investigated using well and disc diffusion method. Shigella spp. and enterotoxigenic E. coli but Salmonella paratyphiB showed no susceptibility to liquorice with concentrations lower than 7.5%, however all tested bacterial strains exhibited susceptibility to high concentration of liquorice. Results obtained from present study showed that G. glabra can be considered as an alternative herbal antibacterial agent against the bacterial strains tested.