Which fluoroquinolone covers MRSA?

Which fluoroquinolone covers MRSA?

• A. Delafloxacin
• B. Levofloxacin
• C. Ciprofloxacin
• D. Moxifloxacin

Answer: (A)

Delafloxacin stands out because it reliably covers MRSA among fluoroquinolones. Fluoroquinolones work by inhibiting bacterial DNA gyrase and topoisomerase IV, but MRSA often becomes resistant to many agents in this class through mutations in these targets and efflux mechanisms. Delafloxacin has enhanced activity against MRSA due to its balanced inhibition of both targets and better potency in acidic environments typical of infected tissues, which helps it perform well against MRSA strains where other fluoroquinolones falter. The other fluoroquinolones listed do not provide consistent MRSA coverage—levofloxacin, ciprofloxacin, and moxifloxacin may work against some organisms, but they are not reliably active enough against MRSA to be used for those infections.

Delafloxacin stands out because it reliably covers MRSA among fluoroquinolones. Fluoroquinolones work by inhibiting bacterial DNA gyrase and topoisomerase IV, but MRSA often becomes resistant to many agents in this class through mutations in these targets and efflux mechanisms. Delafloxacin has enhanced activity against MRSA due to its balanced inhibition of both targets and better potency in acidic environments typical of infected tissues, which helps it perform well against MRSA strains where other fluoroquinolones falter.

The other fluoroquinolones listed do not provide consistent MRSA coverage—levofloxacin, ciprofloxacin, and moxifloxacin may work against some organisms, but they are not reliably active enough against MRSA to be used for those infections.