Staphylococcus aureus was isolated from a patient's surgical wound. In a disk diffusion assay, the isolate was found to be resistant to cefoxitin (30 µg disk). With which antibiotic should this patient's infection be treated?
a. Oxacillin
b. Methicillin
c. Vancomycin
d. Cephalosporin
C
Oxacillin resistance is often detected by the use of 30 µg cefoxitin disk in the disk diffusion or 4 ug/mL cefoxitin in broth dilution methods. Methicillin-resistant S. aureus are considered resistant to all lactam antibiotics (penicillins and cephalosporins). Vancomycin is the drug of choice for strains that are resistant to lactam antibiotics.
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A doctor discovers that her patient can produce antibodies against some bacterial pathogens, but he is unable to protect himself against viral infections. The doctor suspects a disorder in her patient's
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