GiardiaGiardia lambliaGiardiasisCryptosporidiumTrophozoitesFecesCryptosporidiosisCryptosporidium parvumOocystsProtozoan ProteinsProtozoan InfectionsDNA, ProtozoanSymptom AssessmentParasitologyDepressionAntigens, ProtozoanAntiprotozoal AgentsZoonosesRNA, ProtozoanPrevalenceDiplomonadidaMolecular Sequence DataDiarrheaGiardiavirusGenome, ProtozoanEntamoebaSpores, ProtozoanQuestionnairesWater SupplyGenes, ProtozoanGerbillinaeEntamoeba histolyticaTriose-Phosphate IsomeraseTime FactorsSeverity of Illness IndexParasite Egg CountTrichomonas vaginalisBehavioral SymptomsTreatment OutcomePsychiatric Status Rating ScalesMetronidazolePhylogenyRisk FactorsProspective StudiesAntibodies, ProtozoanFluorescent Antibody Technique, DirectBase Sequence