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Published on: February 1, 2014
A real-time PCR assay for detection of emerging infectious Elizabethkingia miricola
Qi Zhang1, Ruixue Hu1, Zemao Gu1
1Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Engineering Technology Research Center for Aquatic Animal Diseases Control and Prevention, Wuhan, 430070, China; ShuangshuishuiShuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China.
Abstract:
Elizabethkingia miricola, a Gram-negative bacillus, is emerging as a life-threatening pathogen in both humans and animals. However, no specific and rapid diagnostic method exists to detect E. miricola. Here, we established a real-time PCR assay for the rapid, sensitive, and specific detection of E. miricola with a wide dynamic range of 108 copies/μL to 102 copies/μL. The detection limit of the real-time assay was 145 copies/μL, which was 100 times more sensitive than conventional PCR. All clinical isolates E. miricola from different host species yield very close Tm (80.25 ± 0.25 °C). Additionally, no cross-reaction or false positives were observed in the assay for non-target bacterial species. The performance of this assay was primarily assessed by testing frog tissue samples. Overall, our study provided a real-time PCR assay, which is a rapid, sensitive, and specific diagnostic method that could be used for early diagnosis and epidemiological investigation of E. miricola.
Insights
A new real-time PCR assay rapidly and sensitively detects Elizabethkingia miricola, a dangerous pathogen. This method offers early diagnosis and epidemiological tracking for E. miricola in humans and animals.
Area of Science:
- Microbiology
- Molecular Biology
- Veterinary Medicine
Background:
- Elizabethkingia miricola is an emerging Gram-negative bacillus causing severe infections in humans and animals.
- Current diagnostic methods for E. miricola lack specificity and speed, hindering timely intervention.
Purpose of the Study:
- To develop a rapid, sensitive, and specific diagnostic assay for Elizabethkingia miricola.
- To establish a real-time PCR method for early detection and epidemiological surveillance of E. miricola.
Main Methods:
- Development and validation of a real-time PCR assay targeting E. miricola.
- Determination of assay sensitivity, specificity, dynamic range, and detection limit.
- Testing the assay's performance on clinical isolates and frog tissue samples.
Main Results:
- The real-time PCR assay demonstrated high sensitivity with a detection limit of 145 copies/μL, 100 times more sensitive than conventional PCR.
- The assay exhibited a wide dynamic range (10^8 to 10^2 copies/μL) and specific detection of E. miricola without cross-reactivity.
- Clinical isolates from various hosts showed consistent melting temperatures (Tm), indicating assay reliability across different sources.
Conclusions:
- The established real-time PCR assay is a rapid, sensitive, and specific tool for detecting Elizabethkingia miricola.
- This assay can facilitate early diagnosis and aid in the epidemiological investigation of E. miricola outbreaks.
- The method holds potential for application in both human and veterinary diagnostics.
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