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Bacterial Phylum Chlamydiae01:29

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The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
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Lateral flow-based antibody testing for Chlamydia trachomatis.

Sarah Gwyn1, Alexandria Mitchell1, Deborah Dean2

  • 1IHRC, Inc., Centers for Disease Control and Prevention, USA.

Journal of Immunological Methods
|May 22, 2016
PubMed
Summary
This summary is machine-generated.

A new lateral flow assay (LFA) detects antibodies to Chlamydia trachomatis Pgp3, aiding trachoma surveillance. This rapid test shows high accuracy with serum and whole blood in field settings.

Keywords:
AntibodyChlamydia trachomatisLateral flowSerosurveillanceTrachoma

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Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Immunology

Background:

  • Chlamydia trachomatis causes trachoma, a leading infectious cause of blindness.
  • Antibody detection against immunodominant antigen Pgp3 is crucial for trachoma surveillance.
  • Existing diagnostic methods can be complex and less suitable for field deployment.

Purpose of the Study:

  • To develop and validate a rapid, field-deployable lateral flow assay (LFA) for detecting antibodies against Chlamydia trachomatis Pgp3.
  • To assess the assay's performance using serum and whole blood samples.
  • To evaluate the assay's utility in a field environment for trachoma surveillance.

Main Methods:

  • A dual sandwich capture lateral flow assay (LFA) was designed using gold-conjugated Pgp3 and a Pgp3 test line.
  • The LFA was tested with human serum, whole blood, and eluted dried blood spots.
  • Assay performance was evaluated against a multiplex assay, assessing agreement, specificity, and inter-rater reliability.
  • Field testing was conducted to assess performance in real-world conditions.

Main Results:

  • The LFA demonstrated high agreement with a multiplex assay for serum (96%) and whole blood (81.5%).
  • Excellent specificity (100%) and high inter-rater agreement (κ=0.961 for serum, κ=0.940 for whole blood) were observed.
  • The assay performed reliably in a field setting, yielding results comparable to laboratory testing.
  • Positive signals were obtained with serum and whole blood, but not with eluted dried blood spots.

Conclusions:

  • A robust lateral flow assay (LFA) for detecting antibodies against Chlamydia trachomatis Pgp3 has been successfully developed.
  • The assay is suitable for use with serum and whole blood, offering a practical solution for antibody-based testing.
  • The LFA's reliability in field settings makes it a valuable tool for trachoma surveillance, particularly post-elimination programs.