Ethanol extract from betel leaf showing antibacterial activity by clear zone around the discs against different bacterial strain, respectively (a) S. aureus ATCC 25923, (b) E. coli ATCC 25922, (c) S. dysenteriae-1 Mj-84, (d) E. coli O157:H7 NCTC 12049, and (e) V. cholera ATCC 6395. Central disc represents the positive control (ciprofloxacin) and the disc around which no clear zone was detected represents the negative control (disc with no extract)