In Section 3.4, the antimicrobial assay of P. guajava extracts and P.g-CuNPs is presented. Table and Figure display the results of the antimicrobial susceptibility test. Both P. guajava extracts and P.g-CuNPs, when applied as prepared disks at all concentrations, exhibited positive inhibition against four tested bacterial strains (Salmonella spp, S. aureus A