LevofloxacinOfloxacinAnti-Infective AgentsAza CompoundsFluoroquinolonesAnti-Bacterial AgentsMicrobial Sensitivity TestsCiprofloxacinQuinolinesQuinolonesNaphthyridinesArea Under CurveStreptococcus pneumoniaeDouble-Blind MethodDrug Resistance, BacterialDNA GyraseDNA Topoisomerase IVAdministration, OralDrug Therapy, Combination