Hi, I have read your query and understood your concern. Staphylococcus is a group of organisms that are commonly seen everywhere and cause infection in the humans. These are classified under bacterial species. Antibiotics are the drugs that act against the infecting bacterial organisms and prevent their growth and its effects. Antibiotics prescribed should be taken as per schedule to have full effect of the drug. Some organisms have resistance to the common antibiotics. So, if the particular antibiotic not cures the infection, culture and sensitivity of the pus is necessary to identify the specific antibiotic. Sensitive drug will cure the wound and prevent the effects of infection. Rocephin belongs to Cephalosporins group that acts against the bacteria. But prolonged use with poor response to the drug gives the impression that the drug is insensitive or became resistant. So, consult the Physician for further management. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pradeepraj, General & Family Physician