S.No Treatment Colony count (CFU/g)
100 250 500 750 1000
1 Control 24×103        
2 Free silver nanoparticles(AgNps) 24×103 21×103 19 ×103 19 ×103 18×103
3 Chitosan coated silver nanoparticles (CS-AgNps) 23×103 21×103 19 ×103 19 ×103 18×103
4 Free copper silver nanoparticles (CuNps) 11×102 11×102 7×101 0.0 0.0
5 Chitosan coated copper nanoparticles (CS-CuNps) 10×102 8×102 7×101 0.0 0.0
Table 3: Effect of nanoparticles on the post treatment persistence of N.rileyi.