Irregular shapes or quasi-spherical shaped AgNPs below 50 nm size were noted for the AgNPs synthesized using WH,MP and OB extracts. Significant antimicrobial activitywas obtained for the biosynthesized AgNPs against selected bacterial threats. PGK AgNPs are highly active against E. coli (29 mm), S. paratyphi (25 mm), S. aureus (22mm) and B. subtilis (20mm) compared to that of standard Gentamicin. OBG was moderately sensitive against E. coli, S. paratyphi and S. aureus, but resistant towards B. subtilis.