Immunomagnetic SeparationCryptosporidium parvumMagneticsEscherichia coli O157OocystsNeoplastic Cells, CirculatingSensitivity and SpecificityFecesPolyvinylsCell SeparationCryptosporidiumPolymerase Chain ReactionParasitologyBacteriological TechniquesFood MicrobiologyEvaluation Studies as TopicShiga Toxin 1GiardiaPolystyrenesCattleWater MicrobiologyWaterFlow CytometryColony Count, MicrobialMilkDNA, BacterialCattle DiseasesAntibodies, MonoclonalCulture MediaLeukapheresisAntigens, CD34Escherichia coli InfectionsAntibodies, BacterialMicrospheresImmunologic TechniquesChymopapainBone Marrow Purging