MoxalactamCephamycinsCephalosporinsCefoperazoneCefotaximePlasmaCefoxitinCefazolinMicrobial Sensitivity TestsMeningitisAnti-Bacterial AgentsLactamsBacteriaCefotetanImipenembeta-LactamsBacterial InfectionsDrug Resistance, MicrobialCeftazidimeTobramycinbeta-LactamasesCefamandolePuerperal InfectionCefmenoximePlasma CellsCephalosporinaseBacteroides fragilisPiperacillin