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SUMMARY A total of 33 extracts representing 26 plant species belonging to 24 families were collected fromdifferent regions of Bangladesh, and screened for their in vitro antibacterial activity againstseveral pathogenic Gram-positive and Gram-negative bacterial strains using the conventionaldisc diffusion method. The most potent activity was exhibited by the extracts of Aegicerascorniculatum, Alocasia fornicata, Ceriops decandra, Cuscuta reflexa, Lasia spinosa, Lantana camara,Pandanus foetidus and Xylocarpus granatum. The extracts of Abtilon indicum, Derris trifoliata,Dendrophthoe falcat, Ruellia tuberosa and X. moluccensis did not show any antibacterial properties attest concentrations.Key words: Antibacterial activity; Medicinal plants; Disc diffusion method; Bangladesh INTRODUCTION Natural products have long been utilized as anindispensable source for the discovery anddevelopment of new drugs. One of the majorsources of these natural products is medicinalplants that have been used traditionally in manycountries to combat various diseases, includinginfections. The healthcare systems in manydeveloping countries like Bangladesh still relysignificantly on the uses of medicinal plants.Bangladesh is one of the South Asian countries thathave a rich and prestigious heritage of medicinalplants’ uses to treat various diseases. As aconsequence, medicinal plants have traditionallyoccupied an important status in the socio-cultural,spiritual and medicinal arena of rural and triballives on Bangladesh. A conservative estimate wouldinclude at least 500 species of medicinal plants thathave been used in Bangladeshi traditional medicines(Ghani, 1998). A survey conducted in 1990 indifferent villages in Bangladesh revealed that onaverage of 14% of people suffering from illnessesapproach qualified allopathic doctors, 29% contactunqualified village doctors, 10% contact mullahs,

Screening of some Bangladeshi medicinal plants for in vitro antibacterial activity