Immunomagnetic SeparationCryptosporidium parvumMagneticsEscherichia coli O157OocystsNeoplastic Cells, CirculatingFecesPolyvinylsSensitivity and SpecificityCryptosporidiumParasitologyCell SeparationFood MicrobiologyPolymerase Chain ReactionShiga Toxin 1Evaluation Studies as TopicBacteriological TechniquesGiardiaPolystyrenesCattleWaterFlow CytometryWater MicrobiologyColony Count, MicrobialMilkCattle DiseasesAntibodies, MonoclonalLeukapheresisAntigens, CD34Escherichia coli InfectionsDNA, BacterialMicrospheresAntibodies, BacterialCulture MediaChymopapainImmunologic TechniquesBone Marrow Purging