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Antibiotic susceptibility testing for Chlamydia trachomatis using flow cytometry

S Dessus-Babus1, F Belloc, C M Bébéar

  • 1Laboratoire de Bactériologie, Université Bordeaux II, France.

Cytometry
|February 5, 1998
PubMed
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Flow cytometry offers a more objective and precise method for evaluating antibiotic activity against Chlamydia trachomatis infections compared to standard microscopic readings. This technique provides reproducible results for antibiotic susceptibility testing, aiding in the assessment of drug efficacy.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Cell Biology

Background:

  • Chlamydia trachomatis infections are a significant global health concern, often requiring effective antibiotic treatment.
  • Accurate antibiotic susceptibility testing is crucial for managing C. trachomatis infections, especially recurrent ones.
  • Traditional methods for determining antibiotic effectiveness, like microscopic Minimal Inhibitory Concentration (MIC) reading, can have limitations in precision.

Purpose of the Study:

  • To compare the effectiveness of flow cytometry versus standard microscopic methods for antibiotic susceptibility testing in C. trachomatis.
  • To evaluate the precision and objectivity of flow cytometry in determining antibiotic activity against C. trachomatis.
  • To assess the in vitro efficacy of doxycycline, ofloxacin, and erythromycin against clinical isolates of C. trachomatis.

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Main Methods:

  • McCoy cells were infected with C. trachomatis (L2 strain and 13 clinical isolates) and treated with serial dilutions of antibiotics.
  • Antibiotic susceptibility was assessed using both standard microscopic MIC reading and a flow cytometric method measuring Mean Fluorescence Intensity (MFI).
  • Flow cytometry involved staining chlamydial inclusions with a fluorescent monoclonal antibody to quantify drug effect via Inhibitory Concentration 50 (IC50).

Main Results:

  • Flow cytometry and microscopic methods yielded equivalent end-point values but similar imprecision.
  • The calculation of IC50 using flow cytometry provided a more objective and precise evaluation of antibiotic activity than MIC.
  • IC50 values were reproducible, independent of antibiotic dilution series, and suitable for comparing drug efficacy against C. trachomatis. No resistant strains were identified.

Conclusions:

  • Flow cytometry offers a reproducible and precise method for antibiotic susceptibility testing of C. trachomatis.
  • The IC50 calculation via flow cytometry is a valuable tool for assessing the in vitro efficacy of antibiotics against C. trachomatis.
  • All tested clinical isolates of C. trachomatis remained susceptible to doxycycline, ofloxacin, and erythromycin.