the stability at -20c and -70c of clindamycin , vancomycin , cephalothin , cefazolin , oxacillin , methicillin , nafcillin , and penicillin was analyzed using staphylococcus eureus , staphylococcus epidermidis , enterococcus , and alpha streptococcus as the test organisms .
C0027324
nafcillin
C0030842
penicillin