Spurious oxacillin resistance in Staphylococcus aureus because of defective oxacillin disks.
Clinical isolates of Staphylococcus aureus wee inappropriately categorized as intermediate or resistant to oxacillin on the basis of tests with two lots of oxacillin disks. The potency of one lot was tested and found to be below accepted limits. Routine quality control tests failed to detect the defective disks.
Boyce
J M
JM
Department of Medicine, Miriam Hospital, Providence, Rhode Island.
Lonks
J R
JR
Medeiros
A A
AA
Papa
E F
EF
Campbell
S
S
D006801:Humans; D008826:Microbial Sensitivity Tests / Q000592:standards*; D010068:Oxacillin / Q000494:pharmacology*; D010403:Penicillin Resistance; D011786:Quality Control; D013211:Staphylococcus aureus / Q000187:drug effects*
D010068:Oxacillin