CefotetanFluoroquinolonesCephamycinsAnti-Infective AgentsCefmetazoleAnti-Bacterial AgentsMicrobial Sensitivity TestsCiprofloxacinOfloxacinDrug Resistance, BacterialAntibiotic ProphylaxisDrug Resistance, MicrobialCefoxitinDNA GyraseAza CompoundsLevofloxacinCefoperazoneQuinolonesNorfloxacinbeta-LactamsDNA Topoisomerase IVBacteroides fragilisCephalosporinsBacteria, AnaerobicPefloxacinColorectal SurgeryNaphthyridinesDrug Resistance, Multiple, BacterialQuinolinesBacteriaAminoglycosidesLactamsEnoxacinBacterial Infectionsbeta-LactamasesCefazolin4-QuinolonesDrug UtilizationStreptococcus pneumoniaeMacrolidesStaphylococcus aureusStreptomycesEscherichia coli