SulfamethoxazoleFolic AcidTrimethoprimTrimethoprim-Sulfamethoxazole CombinationFolic Acid DeficiencyNeural Tube DefectsFolic Acid AntagonistsTetrahydrofolatesDapsoneHomocysteineFood, FortifiedDietary SupplementsVitamin B 12Vitamin B ComplexAnti-Infective AgentsAnti-Bacterial AgentsMicrobial Sensitivity TestsPreconception CareDrug HypersensitivityPneumonia, PneumocystisTrimethoprim ResistanceSulfisoxazoleDrug Resistance, BacterialFolate Receptors, GPI-AnchoredDrug Resistance, Multiple, BacterialHyperhomocysteinemiaDrug Combinations4-Aminobenzoic AcidIntegronsAnemia, MacrocyticHematinicsVitamin B 6Pteroylpolyglutamic AcidsPneumocystis jiroveciiSulfadiazinePentamidineVitamin B 12 DeficiencyFolic Acid TransportersTropherymaUrinary Tract InfectionsDihydropteroate SynthaseStenotrophomonas maltophiliaPregnancyBreadSulfamethoxypyridazineVitaminsPrenatal CareMegaloblastsNocardia InfectionsDrug Resistance, MicrobialDrug SynergismWhipple DiseaseFlourFolate Receptor 1HaptensMethylenetetrahydrofolate Reductase (NADPH2)Escherichia coli InfectionsShigella sonneiAdministration, OralPrenatal Nutritional Physiological PhenomenaNocardiaAnti-Infective Agents, UrinaryFormyltetrahydrofolatesSpinal DysraphismTetrahydrofolate DehydrogenaseTabletsAminopterinDouble-Blind MethodDrug EruptionsPneumocystisVibrio cholerae O1Escherichia coliShigellaReduced Folate Carrier ProteinCiprofloxacinPterinsHydroxylaminesSalmonella entericaFIGLU TestEnterobacteriaceaePyridoxineCerealsSalmonellaRifampinMicronutrientsElectrophoresis, Gel, Pulsed-FieldNalidixic AcidDietDose-Response Relationship, DrugMethotrexateAnencephalyNutritional RequirementsHomocystineMethylmalonic AcidNutrition PolicyFecesTime FactorsChromatography, High Pressure LiquidCholeraSulfonamides