Amongst all the test bacterial strains, S. flexneri showed maximum zone of inhibition
(27±1 mm) at the highest amount of extract (75 mg). This was followed by E. faecalis (24 ±1
mm) and E. coli (22 ± 0.5 mm). S. aureus displayed the lowest diameter of zone of inhibition
(19 ± 1) at that amount of extract. All the test bacteria responded to the extract in a dosedependent way. However S. typhimurium showed no zone of inhibition (Table 1). Thus it proved
to be resistant towards the ethanol extract of the Paederia foetida at the applied amounts (75, 50
and 25 mg). Thus the ethanol extract of Paederia foetida showed strong antibacterial activity
against S. flexneri and E. faecalis and moderate activity against E. coli and S. aureus. The results
are expressed as the radial extent of the annular zone of inhibition including the 7 mm diameter
of the well