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Wang CH, Lu PL, Liu EYM, Chen YY, Lin FM, Lin YT, Chang FY, Lin JC. Rapid identification of capsular serotype K1/K2 Klebsiella pneumoniae in pus samples from liver abscess patients and positive blood culture samples from bacteremia cases via an immunochromatographic strip assay. Gut Pathog 2019; 11:11. [PMID: 30828389 PMCID: PMC6385414 DOI: 10.1186/s13099-019-0285-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 02/02/2019] [Indexed: 01/02/2023] Open
Abstract
Background In Asia, serotype K1/K2 Klebsiella pneumoniae are the major capsular serotypes that cause liver abscess or bacteremia in patients. The purpose of this study was to compare novel immunochromatographic strips (ICSs), which can rapidly detect K. pneumoniae serotypes K1/K2 in clinical samples, to conventional capsular serotyping methods. Methods Pus drainage samples from 16 patients with a liver abscess caused by K. pneumoniae, blood samples from 112 positive flagged blood culture bottle and a subsequent single colony in the medium were tested with the ICS. The results were then compared to findings of capsular swelling tests. Samples subjected to the polymerase chain reaction (PCR) analysis were used as reference. Results The identification of K. pneumoniae via the traditional bacterial culture from pus samples took 3.4 days on average (ranging from 2.2 to 5.5 days). Further capsular serotyping of K. pneumoniae by the capsular swelling test of pure isolates lasted 5–10 min, and the PCR method took ~ 4 h. As for ICSs, the time for direct identification of the K. pneumoniae capsular serotype K1/K2 in pus was < 4 min (ranging from 2 to 4 min). The results of ICSs were consistent with capsular swelling tests and PCR methods. Testing of 112 blood culture samples and subsequent single colonies in the medium with ICSs yielded consistent results for most samples. Conclusions This study indicates that ICSs can rapidly detect K. pneumoniae serotypes K1 and K2 in pus or positive flagged blood culture broth samples within 5 min. Their accuracy is comparable to that of the conventional capsular serotyping methods such as a serum agglutination assay or PCR.
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Affiliation(s)
- Ching-Hsun Wang
- Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Po-Liang Lu
- 2Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung City, Taiwan, ROC.,3College of Medicine, Kaohsiung Medical University, Kaohsiung City, Taiwan, ROC
| | - Esther Yip-Mei Liu
- Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Yih-Yuan Chen
- 4Department of Biochemical Science and Technology, National Chiayi University, Chiai-Yi, Taiwan, ROC
| | - Fu-Mei Lin
- 5Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli, Taiwan, ROC
| | - Yi-Tsung Lin
- 6Division of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.,7School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Feng-Yee Chang
- Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Jung-Chung Lin
- Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
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