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Updated: Apr 17, 2026
Forward Genetic Approaches in Chlamydia trachomatis
Published on: October 23, 2013
Performance evaluation of two microbial transport media designed for preservation and transport of Chlamydiae,
Sara L Jones1, Kunapuli T Madhusudhan2, Krystle Agans1
1Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive SE, Albuquerque, NM 87108, USA.
Abstract:
The ability of a non-propagating transport device (test device) to maintain the viability of clinically relevant bacteria was compared with a similar commercial device (predicate device) to establish performance equivalence. Test bacteria, namely Chlamydia trachomatis, Chlamydia pneumoniae, Mycoplasma hominis, Mycoplasma pneumoniae and Ureaplasma urealyticum, were inoculated into the test [Puritan Medical Products Universal Transport System (UniTranz-RT(TM))] and predicate (BD Universal Viral Transport System) devices, and incubated at 4 °C and room temperature for up to 72 h. Bacterial viability was assessed at selected time points post-incubation using shell vial assays followed by immunofluorescence staining (for Chlamydia) or by standard culture techniques (for Mycoplasma and Ureaplasma). Results indicated that the Chlamydia strains were equally stable in both test and predicate devices through 72 h storage, at both test temperatures. Quantifiable levels of Mycoplasma and Ureaplasma were recovered from the test and predicate devices throughout the storage period. Low-temperature storage improved bacterial viability when compared with room temperature storage. In addition, the predicate device demonstrated slightly improved performance versus the test device in the context of Mycoplasma and Ureaplasma following 72 h storage. The overall results of the study confirmed the full performance of UniTranz-RT(TM) as a microbial transport medium and established equal performance with the predicate device.
Insights
The Puritan Medical Products Universal Transport System (UniTranz-RT(TM)) effectively maintains bacterial viability, demonstrating performance equivalence to a commercial device for key respiratory and urogenital pathogens. Low-temperature storage enhances bacterial stability.
Area of Science:
- Clinical Microbiology
- Medical Device Performance Evaluation
- Bacterial Transport Systems
Background:
- Accurate bacterial detection relies on maintaining pathogen viability during transport.
- Non-propagating transport devices are crucial for preserving microbial integrity.
- Performance equivalence studies are necessary for validating new transport systems.
Purpose of the Study:
- To evaluate the performance of the Puritan Medical Products Universal Transport System (UniTranz-RT(TM)) for bacterial viability.
- To establish performance equivalence between UniTranz-RT(TM) and a predicate commercial device.
- To assess the impact of storage temperature and duration on bacterial stability.
Main Methods:
- Clinically relevant bacteria (Chlamydia, Mycoplasma, Ureaplasma) were inoculated into test (UniTranz-RT(TM)) and predicate devices.
- Samples were incubated at 4°C and room temperature for up to 72 hours.
- Bacterial viability was assessed using shell vial assays, immunofluorescence staining, and standard culture techniques.
Main Results:
- Chlamydia strains showed equal stability in both devices at both temperatures for 72 hours.
- Quantifiable Mycoplasma and Ureaplasma were recovered from both devices throughout storage.
- Low-temperature storage (4°C) improved bacterial viability compared to room temperature.
Conclusions:
- UniTranz-RT(TM) demonstrates full performance as a microbial transport medium.
- The study established performance equivalence between UniTranz-RT(TM) and the predicate device.
- Storage temperature significantly impacts bacterial viability in transport devices.
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