A study that compared the efficacy of moxifloxacin vs. azithromycin in treating Mycoplasma genitalium — an STI with a rising resistance to antibiotics — showed that moxifloxacin was the clear winner.In the phase 4 randomized trial, a 10-day regimen of moxifloxacin yielded a significantly higher microbiologic cure rate compared with a 6-day regimen of azithromycin (87% vs. 61.2%;