The maximum zone i.e. 9.0 mm was REFERENCES
given by SR H while 35 C and PJ 2 showed the clear zone
of 7.0 mm. SR H, staphylococcus species, has shown
moderate activity against S. aureus. This can be due to
the inherit defense mechanism of a strain to secret
antimicrobial agents such as bacteriocins that prevent
the growth of other strains of the same specie [18].
Gram positive bacteria especially certain species of
staphylococcus are also known to exhibit ability to
produce such antimicrobial agents like colicin by E. coli
against other strains such as ColN and ColE1 against
E. coli F4 (K88)