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PHRP : Osong Public Health and Research Perspectives

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4 "SeongHan Kim"
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Original Articles
Molecular Typing of Mycobacterium intracellulare Using Pulsed-Field Gel Electrophoresis, Variable-Number Tandem-Repeat Analysis, Mycobacteria Interspersed Repetitive-Unit-Variable-Number Tandem Repeat Typing, and Multilocus Sequence Typing: Molecular Characterization and Comparison of Each Typing Methods
Semi Jeon, Nara Lim, Seungjik Kwon, Taesun Shim, Misun Park, Bum-Joon Kim, Seonghan Kim
Osong Public Health Res Perspect. 2014;5(3):119-130.   Published online June 30, 2014
DOI: https://doi.org/10.1016/j.phrp.2014.04.003
  • 1,731 View
  • 14 Download
  • 8 Citations
AbstractAbstract PDF
Objectives
Mycobacterium intracellulare is the major causative agent of nontuberculous mycobacteria-related pulmonary infections. The strain typing of M. intracellulare is important for the treatment and control of its infections. We compared the discrimination capacity and effective value of four different molecular typing methods.
Methods
Antibiotic susceptibility testing, hsp65 and rpoB sequencing, pulsed-field gel electrophoresis (PFGE), multilocus sequence typing (MLST), mycobacteria interspersed repetitive-unit-variable-number tandem-repeat analysis (MIRU-VNTR), and VNTR assay targeting 44 M. intracellulare isolates obtained from patients with pulmonary infections were performed.
Results
All the antibiotic susceptibility patterns had no association with the molecular and sequence types tested in this study; however, the molecular and sequence types were related with each other. PFGE gave best results for discriminatory capacity, followed by VNTR, MLST, and MIRU-VNTR.
Conclusion
The high discriminatory power of PFGE, VNTR, and MLST is enough for differentiating between reinfection and relapse, as well as for other molecular epidemiological usages. The MLST could be regarded as a representative classification method, because it showed the clearest relation with the sequence types.
Multiplex Real-time Polymerase Chain Reaction Assays for Simultaneous Detection of Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificus
Jie Yeun Park, Semi Jeon, Jun Young Kim, Misun Park, Seonghan Kim
Osong Public Health Res Perspect. 2013;4(3):133-139.   Published online June 30, 2013
DOI: https://doi.org/10.1016/j.phrp.2013.04.004
  • 1,990 View
  • 21 Download
  • 15 Citations
AbstractAbstract PDF
Objectives
A multiplex real-time polymerase chain reaction (RT-PCR) method was developed for the identification of three Vibrio species: Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificus.
Methods
Specific primers and probes targeting the hlyA, tlh, and vvhA genes were selected and used for multiplex real-time PCR to confirm the identification of V. cholerae, V. parahaemolyticus, and V. vulnificus, respectively. This method was applied to screen Vibrio species from environmental samples and combining it with a culture-based method, its effectiveness was evaluated in comparison with culture-based methods alone.
Results
Specific PCR fragments were obtained from isolates belonging to the target species, indicating a high specificity of this multiplex real-time PCR. No cross-reactivity with the assay was observed between the tested bacteria. The sensitivity of the multiplex real-time PCR was found to have a lower limit of 104 colony-forming units/reaction for all three Vibrio species. The combination strategy raised the isolation ratio of all three Vibrio species 1.26- to 2.75-fold.
Conclusion
This assay provides a rapid, sensitive, and specific technique to detect these three Vibrio species in the environment.
Availability of Clean Tap Water and Medical Services Prevents the Incidence of Typhoid Fever
Deog-Yong Lee, Esther Lee, HyeMin Park, SeongHan Kim
Osong Public Health Res Perspect. 2013;4(2):68-71.   Published online April 30, 2013
DOI: https://doi.org/10.1016/j.phrp.2013.03.005
  • 1,899 View
  • 19 Download
  • 2 Citations
AbstractAbstract PDF
Objective: In this study, the factors that induced a decrease in the incidence of typhoid fever were analyzed. Based on the study results, we propose a quantitative and concrete solution to reduce the incidence of typhoid fever.
Methods
We analyzed the incidence and fatality rate of typhoid fever in Korea. Tap water service rate and the number of pharmacies, which affect the incidence rate of typhoid fever, were used as environmental factors.
Results
To prevent typhoid fever in the community, it is necessary to provide clean tap water service to 35.5% of the population, with an individual requiring 173 L of clean water daily. Appropriate access to clean water (51% service coverage, 307 L) helped the population to maintain individual hygiene and food safety practices, which brought about a decrease in the incidence of typhoid fever, and subsequently a decrease in fatality rate, which was achieved twice. During the 8-year study period, the fatality rate decreased to 1% when the population has access to proper medical service.
Conclusion
The fatality rate was primarily affected by the availability of medical services as well as by the incidence of typhoid fever. However, an analysis of the study results showed that the incidence of typhoid fever was affected only by the availability of clean water through the tap water system.
Articles
Multiplex Real-Time Polymerase Chain Reaction-Based Method for the Rapid Detection of gyrA and parC Mutations in Quinolone-Resistant Escherichia coli and Shigella spp.
Junyoung Kim, Semi Jeon, Hyungjun Kim, Misun Park, Soobok Kim, Seonghan Kim
Osong Public Health Res Perspect. 2012;3(2):113-117.   Published online June 30, 2012
DOI: https://doi.org/10.1016/j.phrp.2012.04.004
  • 1,832 View
  • 14 Download
  • 5 Citations
AbstractAbstract PDF
Two real-time polymerase chain reaction assays were developed to detect mutations in codons 83 and 87 in gyrA and in codons 80 and 91 in parC, the main sites that causes quinolone resistance in pathogenic Escherichia coli and Shigella spp. isolates. These assays can be employed as a useful method for controlling infections caused by quinolone-resistant E coli and Shigella isolates.

PHRP : Osong Public Health and Research Perspectives