Disclosed are methods for treating various bacterial infections with (2R,4S,4aS)-11-fluoro-2,4-dimethyl-8-[(4S)-4-methyl-2-oxo-1,3-oxazolidin-3-yl]-1,2,4,4a-tetrahydro-2'H,6H-spiro[1,4-oxazino[4,3-a][1,2]oxazolo[4,5-g]quinoline-5,5'-pyrimidine]-2',4',6' (1'H,3'H)-trione, or a pharmaceutically acceptable salt thereof.L'invention concerne des méthodes pour traiter diverses infections bactériennes avec (2R,4S,4aS)-11-fluoro-2,4-diméthyl-8-[(4S)-4-méthyl-2-oxo-1,3-oxazolidin-3-yl]-1, 2,4,4a-tetrahydro-2'H,6H-spiro[1,4-oxazino[4,3-a][1,2]oxazolo[4,5-g]quinoline-5,5'-pyrimidine]-2',4',6' (1'H,3'H)-trione, ou un sel pharmaceutiquement acceptable de celui-ci.