Method 1623
Giardia & Cryptosporidium
Interfering Organisms: Giardia-like DIC
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Observations on DIC that help distinguish an interfering organism from Giardia:

  • The wall observed on DIC is not superimposed by the FITC fluorescing wall
  • More than one wall
  • Variations in wall width
  • Openings or breaks in wall
  • Internals composed of small spheres
  • Internals composed of more than one large distinct mass
  • Organism composed of multiple cells
  • Giardia internal morphology
  • Presence of mucilage around the organism
  • Atypical shape and size
  • Presence of colored internal structures
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