AmpicillinMethemoglobinemiaAmpicillin ResistanceMethylene BlueToxicity TestsSister Chromatid ExchangeIntestinal NeoplasmsSulbactamAnti-Bacterial AgentsPivampicillinMicrobial Sensitivity TestsPenicillinsPenicillin ResistanceMutagensRats, Inbred F344AnemiaCricetulusIntestine, SmallLymphomaMice, Inbred StrainsHaemophilus influenzaeDrug Resistance, MicrobialAdministration, Oralbeta-LactamasesChloramphenicolNeoplasms, ExperimentalChromosome AberrationsGentamicinsPenicillin GPenicillinaseTrimethoprimSulfamethoxazoleR FactorsDrug Resistance, BacterialTetracyclinePenicillanic AcidEscherichia coliCloxacillinEnterococcus faecalisCephalosporinsCephalexinEnterococcus faeciumbeta-LactamsDysentery, BacillaryAmoxicillinEnterobacteriaceaeDrug Resistance, Multiple, BacterialTalampicillinCarbenicillinProbenecidCephaloridineGram-Positive Bacterial InfectionsShigellaKlebsiellaFecesConjugation, GeneticTrimethoprim-Sulfamethoxazole CombinationNitrofurantoinHaemophilus InfectionsProteusEnterococcusShigella sonneiPenicillin VCephalothinSalmonella InfectionsCefamandoleSalmonellaDNA, BacterialCeftriaxoneMeningitisStreptomycinPenicillin-Binding ProteinsMeningitis, HaemophilusChloramphenicol ResistanceCefotaximeDrug Therapy, CombinationKanamycinNalidixic AcidCephalosporinaseCefuroximeClavulanic AcidsMeningitis, ListeriaEscherichia coli InfectionsLactamsSalmonella typhiPlasmidsCiprofloxacinEnterobacterAnti-Infective AgentsUrinary Tract InfectionsTyphoid FeverBacteriaVancomycinAmoxicillin-Potassium Clavulanate CombinationMezlocillinCulture MediaEndocarditis, BacterialAmdinocillin PivoxilDrug SynergismShigella dysenteriae