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  • Treponema pallidum particle agglutination
  • Passive particle agglutination test that replaced the MHA-TP
  • Agglutination of gel particles coated with Treponema pallidumantigen
  • If antibodies are present, the particles form a mat on the bottom of the microtiter well
  • If antibodies are not present, the particles fall to the bottom of the well in a compact button