Possibly Cefazolin -1st Generation of Cefalosporins

Read this article by Tonna et al. "A focus on the newer antibiotics targeting Gram-positive bacteria". I think it is available online.

You can try a mixture of Lysostaphin and Lysozyme... Although they are not antibiotics but chemicals..

Thank you every one. Cefazolin also affect gram positive bacilli. I will try Lysostaphin but I guess it has its activity against Staphylococcus only.

Any help would be much appreciated.

Why do you think you're suffering contamination  if you are aware of aseptic technique?

you can add Furazolidone and Mupirocin.. Have minimal activity against GPB

Thank you Sayan. I hope it will work.

thanks for all