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Identification of Yersinia spp. with the API 20E system
J R Archer1, R F Schell, D R Pennell
1State Laboratory of Hygiene, University of Wisconsin, Madison 53706.
Journal of Clinical Microbiology
|December 1, 1987
Summary
The API 20E system accurately identifies Yersinia species. Removing the Voges-Proskauer test significantly improved identification rates to 93% at 28°C.
Area of Science:
- Microbiology
- Clinical Diagnostics
- Bacterial Identification
Background:
- Accurate identification of Yersinia species is crucial for clinical diagnostics.
- Conventional biochemical tests can be time-consuming and may have limitations.
- The API 20E system is a common method for bacterial identification.
Purpose of the Study:
- To evaluate the performance of the API 20E system for identifying clinical isolates of Yersinia species.
- To compare the API 20E system with conventional biochemical tests.
- To determine the impact of specific test modifications on identification accuracy.
Main Methods:
- 105 clinical isolates of Yersinia species were tested.
- API 20E system performance was assessed at 28°C and 37°C.
- Results were compared against conventional biochemical testing.
- The effect of excluding the Voges-Proskauer test was analyzed.
Main Results:
- The API 20E system showed varying identification accuracy depending on incubation temperature.
- Eliminating the Voges-Proskauer test (recorded as negative) significantly improved correct identifications.
- Correct identification rates for Yersinia spp. increased from 66% to 93% at 28°C with this modification.
- Incubation temperature influenced the accuracy of the API 20E system.
Conclusions:
- The API 20E system, with modification, offers a highly accurate method for Yersinia species identification.
- Excluding the Voges-Proskauer test is recommended for improved Yersinia spp. identification using API 20E at 28°C.
- This optimized approach enhances clinical diagnostic efficiency for Yersinia infections.