Abstract: A method of, apparatus for and test kit for determining the presence of an analyte in a sample during an immunoassay, wherein the sample is contacted with a porous carrier carrying, an immobilized form on its surface, a binding partner for the analyte of interest, the carrier is backwashed to remove unbound material at said surface, and the presence of analyte bound to the carrier surface is determined.

Abstract: A process for determining qualitatively or quantitatively the presence of Chlamydia Trachomatis or Chlamydia trachomatis derived material in a subject material which process comprises deriving a sample from said subject material Chlamydia trachomatis derived material, contacting said sample with an antibody for a Chlamydia trachomatis derived material bound to a substrate thereby to bind at least a portion of the Chlamydia trachomatis derived material, contacting the bound Chlamydia trachomatis derived material with a conjugate between a substance which will bind selectively to the Chlamydia trachomatis derived material and a catalyst for a reaction system thereby to bind said conjugate to said bound Chlamydia trachomatis derived material, carrying out the reaction system catalysed by said catalyst and determining a product of said reaction system, characterised in that the sample is derived from the subject material by a process including heating the subject material to an elevated temperature and for a peri