Ki Hwan Kim

Korea Atomic Energy Research Institute (KAERI), Daiden, Daejeon, South Korea

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Publications (61)107.72 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Pectus excavatum is the most common congenital chest wall deformity, with a high incidence in live births. This study aimed to evaluate the measured factors on CT images related to the number of pectus bars for surgical correction. A total of 497 patients who had undergone minimally invasive repair between April 2007 and July 2011 were classified into single-bar (n=358) and doublebar (n=139) insertion groups. We measured eight distinct distances and one angle on CT scans to reflect quantitative assessment. Univariate analysis and multivariate logistic regression analysis were performed to detect statistically significant association between radiologic measurements and the pectus bars required. After adjusting for age and gender, the transverse distance (T), the transverse distance of the depression area (A), the inclined distance of the depression area (B), the AP distance of the depression area (C), the depression angle (G), and the eccentric distance of deformity (E) were significantly correlated with double-bar insertion. The regression model showed that age (P<0.0001), gender (P<0.0001), depression angle (G) (P<0.0001), direction of the depression (DD) (P<0.0001) and depression depth (D) (P<0.0001) were significantly associated with double-bar insertion. CT scan provides useful factors which can be of assistance in predicting the number of pectus bars for the surgical correction of pectus excavatum.
    World journal of pediatrics : WJP. 11/2014;
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    ABSTRACT: Bumblebee Bombus ignitus, which is indigenous to Korea, Japan, and China, has been recognized as a valuable pollinator for both crops and wild plants. Bombus ignitus has now become commercially important as a pollinator because of its use in the agricultural industry, particularly for greenhouse pollination. For long-term management and effective conservation of B. ignitus, an understanding of the genetic structure of its naturally occurring populations is practically important. In this study, the genetic structure among the five populations of B. ignitus in South Korea was assessed using nine microsatellite loci. These markers showed high levels of genetic variability, with the number of alleles ranging from 6 to 22 (mean = 13.4) and the frequency of the most common allele ranging from 0.11 to 0.66. Only the Sabuk (SB) population showed a genetic signature of a recent bottleneck, which was further supported by the lowest level of allelic richness (AR) (mean AR = 3.944). Genetic differentiation was highly significant among all pairs of populations (P < 0.001) across the nine microsatellite markers, suggesting a lack of gene flow among those populations. Interestingly, FST (and RST and Dest) values were always greater for the Taebaek population than for the four remaining populations. The phylogenetic analysis showed evidence supporting our hypothesis that the Taebaek population is genetically more divergent than the other populations. Overall, our results suggest that the Korean populations of B. ignitus might have undergone geographic isolation and have become highly separated spatially from one another, thereby having a limited range of migration among their local habitats.
    Entomological Research 11/2014; 44:262-270.
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    ABSTRACT: The prognosis of patients with stage III/IV NK/T-cell lymphoma (NTCL) is extremely poor. Although L-asparaginase (L-asp) is effective for NTCL, its significance has not been clearly demonstrated. In addition, there are few studies comparing treatment outcomes in stage III/IV NTCL. This study evaluated the efficacy of L-asp-based chemotherapy and prognostic factors in stage III/IV NTCL. Seventy patients with newly diagnosed stage III/IV NTCL were enrolled between January 2000 and February 2013. Patients received ifosfamide, etoposide, methotrexate, and prednisolone (IMEP) plus L-asp (N = 22) or combination chemotherapy without L-asp (N = 48) as a first-line treatment. Clinical prognostic factors, treatment outcomes, and prognostic scores were compared between the groups. After a median follow-up period of 12.8 months (range, 1.1-186.6 months), median overall survival (OS) and progression-free survival (PFS) were 11.3 and 5.6 months, respectively. Treatment outcomes were superior in patients treated with IMEP plus L-asp compared to those treated with chemotherapy without L-asp (overall response rate, 90.0 vs. 34.8 %, P < 0.001; complete remission rate, 65.0 vs. 21.7 %, P = 0.001). The OS and PFS were significantly higher for the IMEP plus L-asp group compared with the chemotherapy without L-asp group. In a multivariate analysis, the use of chemotherapy without L-asp was an independent predictor of reduced OS (hazards ratio (HR) = 2.18, 95 % confidence interval (CI) 1.08-4.40; P = 0.030) and PFS (HR = 2.29, 95 % CI 1.22-4.29; P = 0.010). IMEP plus L-asp is active against stage III/IV NTCL, and it is an independent predictor of improved survival.
    Annals of Hematology 10/2014; · 2.87 Impact Factor
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    ABSTRACT: To develop a re-usable crucible, the issues of thermal expansion mismatch between coatings and crucibles are very important. Here, we present a coating technology for the crucibles to prevent material interactions with the U–Zr/U–TRU–Zr fuels. Y2O3, TiC, and TaC coating materials were selected as promising coating. Various combinations of coating conditions such as the coating thickness and double layer coating methods were investigated to find the bonding effect in pursuit of more effective ways to withstand the thermal stresses. Among the six coating methods investigated, even though all coating methods maintained good coating integrity in U–Zr melt, most of the coating method samples did not maintain integrity in the U–Zr–RE melt because of the cracks or microcracks of the coating layer, presumably formed from the thermal expansion difference. Only double layer coating of TaC and Y2O3 survived the 2-cycle dipping test of U–Zr–RE melt, which is likely caused by the good adhesion of the TaC onto the niobium rod and the chemical inertness of Y2O3 in a U–Zr–RE melt.
    Journal of Applied Statistics 10/2014; 6(10). · 0.45 Impact Factor
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    ABSTRACT: The combination of fast reactors and an advanced fuel cycle processes is considered as a potential option for sustaining nuclear power generation without producing excessive high level wastes. Korea has explored pyroprocessing technology associated with sodium-cooled fast reactors (SFRs) to close the fuel cycle by repeatedly processing SFR spent fuels. To realize the whole pyroprocessing concept with fuel fabrication, it is important to integrate individual developments and calculate a material flow from feed to final products. In this study, SFR Fuel Manufacturing Facility (SFMF) is conceptualized to support 6 SFRs with 1200 MWe each. In the pyroprocessing section, spent fuels are treated by electrochemical steps and metallic products are prepared for the following fuel fabrication. The recovered materials are converted into slugs and loaded in fuel tubes to become fuel assemblies. A site layout for SFMF was planned and a main building was conceptually designed. As an economic approach to the proposed facility, the unit cost estimation (5511 $/kgHM denominated in 2009 U.S. dollars) for SFMF is also analyzed with the conceptual design with preliminary sensitivity assessments including decontamination and decommissioning costs, a discount rate, staffing costs, and plant lifetime. While classifying and describing cost details of SFMF, this study compares the unit cost of SFMF treating SFR spent fuel to that of the pyroprocessing facility treating PWR spent fuel.
    Nuclear Engineering and Design 10/2014; 277:225–233. · 0.81 Impact Factor
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    ABSTRACT: A new live attenuated Japanese encephalitis chimeric virus vaccine (JE-CV) has been developed based on innovative technology to give protection against JE with an improved immunogenicity and safety profile. In this phase 3, observer-blind study, 274 children aged 12-24 months were randomized 1:1 to receive one dose of JE-CV (Group JE-CV) or the SA14-14-2 vaccine currently used to vaccinate against JE in the Republic of Korea (Group SA14-14-2). JE neutralizing antibody titers were assessed using PRNT50 before and 28 days after vaccination. The primary endpoint of non-inferiority of seroconversion rates on D28 was demonstrated in the Per Protocol analysis set as the difference between Group JE-CV and Group SA14-14-2 was 0.9 percentage points (95% confidence interval [CI]: -2.35; 4.68), which was above the required -10%. Seroconversion and seroprotection rates 28 days after administration of a single vaccine dose were 100% in Group JE-CV and 99.1% in Group SA14-14-2; all children except one (Group SA14-14-2) were seroprotected. Geometric mean titers (GMTs) increased in both groups from D0 to D28; GM of titer ratios were slightly higher in Group JE-CV (182 [95% CI: 131; 251]) than Group SA14-14-2 (116 [95% CI: 85.5, 157]). A single dose of JE-CV was well tolerated and no safety concerns were identified. In conclusion, a single dose of JE-CV or SA14-14-2 vaccine elicited a comparable immune response with a good safety profile. Results obtained in healthy Korean children aged 12-24 months vaccinated with JE-CV are consistent with those obtained in previous studies conducted with JE-CV in toddlers.
    Human vaccines & immunotherapeutics. 08/2014;
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    ABSTRACT: A 46-year-old man with a past history of retroperitoneal fibrosis was admitted with an enlarged, hard right testis. The paratesticular lesion showed heterogeneous hypoechogenicity on ultrasonography, low signal intensity on T1- and T2-weighted magnetic resonance imaging (MRI), and lack of diffusion restriction on diffusion-weighted MRI. Following steroid treatment, the paratesticular mass was decreased in size on follow-up computed tomography. The radiologic and clinical features are recognized as a manifestation of immunoglobulin G4-related sclerosing disease involving the paratesticular region and retroperitoneum. © 2014 S. Karger AG, Basel.
    Urologia Internationalis 08/2014; · 1.07 Impact Factor
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    ABSTRACT: Delta neutrophil index (DNI) has been reported to be useful in assessing the prognosis of suspected bacteraemia in adults. However, data in children are limited. The purpose of this study was to investigate the correlation between the DNI and bacteraemia in children and to compare DNI values between immunocompetent and immunocompromised hosts.
    Clinica Chimica Acta. 06/2014; 436.
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    ABSTRACT: Owing to the high chemical reactivity of molten uranium alloys, the use of traditional graphite crucibles for casting fuel slugs for a sodium-cooled fast reactor (SFR) is problematic. Moreover, rare earth (RE) elements retained in the fuel slugs for an SFR, which are extracted from the spent fuel by pyro-processing, are more reactive than uranium melt. Therefore, in this study, Y2O3 single-layer coatings with thicknesses of approximately 50, 70, and 120 μm and double-layer coatings of TaC/Y2O3 and Y2O3/TaC were plasma-sprayed onto niobium substrates and tested for thermal shock resistance and compatibility against U–10 wt% Zr and U–10 wt% Zr–5 wt% RE melt. The Y2O3 single-layer coating, regardless of coating thickness, and the TaC/Y2O3 double-layer coating showed good contact at the interface between the coating and the niobium substrate, with no deterioration after the thermal cycling test. In the interaction studies, the single- and double-layer coatings showed good compatibility with the U–Zr melt. However, the Y2O3 coatings with thicknesses of approximately 50 and 70 μm showed severe penetration of the U–Zr–RE melt and reacted with the niobium substrate. The single-layer Y2O3 coating with a thickness of 120 μm and the double-layer TaC/Y2O3 coating exhibited the most promising performance among the candidate coatings.
    Journal of Radioanalytical and Nuclear Chemistry 06/2014; 300(3). · 1.41 Impact Factor
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    ABSTRACT: Blood culture is the most important tool for detecting bacteremia in children with fever. However, blood culture contamination rates range from 0.6% to 6.0% in adults; rates for young children have been considered higher than these, although data are limited, especially in Korea. This study determined the contamination rate and risk factors in pediatric patients visiting the emergency room (ER) or being admitted to the ward.
    Korean Journal of Pediatrics 04/2014; 57(4):178-85.
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    ABSTRACT: Hypoxia is a consistent finding in fast-growing tumors; it contributes to tumor progression and therapeutic responses. We explored the expression of hypoxia-associated biomarkers in head and neck squamous cell carcinoma (HNSCC) to assess their relationship with clinical factors in HNSCC. In total, 90 patients with HNSCC were enrolled. Expression of HIF-1α, HSP70, HSP90, VEGF, IGF-1R, and P16 was investigated by immunohistochemistry. Their correlations with clinical factors, including location of primary sites, T stage, N stage, M stage, HPV status, primary treatment success/failure, recurrences, disease-free survival (DFS), and overall survival, were analyzed. HIF-1α, HPS70, HPS90, VEGF, and IGF-1R were positive in 33 of 89 (37.1 %), 62 of 87 (71.3 %), 83 of 89 (93.3 %), 41 of 87 (47.1 %), and 50 of 56 (89.3 %) cases, respectively. Expression levels of some of these markers were correlated. High HIF-1α or HSP 70 correlated with poor DFS, and expression of HSP70 correlated with LN metastasis. HPV-related carcinomas showed high HSP 70 and IGF-1R expression. Hypoxia-associated proteins were highly expressed and associated with aggressive clinical features in HNSCC. Expression of HIF-1α or HSP70 can be considered poor prognostic indicator in HNSCC. Our results suggest that hypoxic signaling is activated in HNSCC, especially in HPV-related tumors.
    Archives of Oto-Rhino-Laryngology 03/2014; · 1.29 Impact Factor
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    ABSTRACT: Human bocavirus (HBoV) was first recognized in respiratory samples in 2005. The clinical importance of HBoV infection remains unclear. This report describes the clinical features and molecular phylogeny of HBoV isolates in children with acute respiratory infections. Nasopharyngeal aspirates were obtained from 1,528 children with acute respiratory infections between 2010 and 2011. Respiratory samples were screened for HBoV by multiplex PCR. A phylogenetic analysis of the HBoV VP1/VP2 gene was also undertaken. HBoV was detected in 187 (12.2%) of the 1,528 patients with a peak incidence of infection observed in patients aged 12-24 months. Coinfection with other respiratory viruses was observed in 107 (57.2%) of the HBoV-positive children. The peak of HBoV activity occurred during the month of June in both 2010 and 2011. A higher previous history of wheezing (P = 0.016), a higher frequency of chest retraction (P < 0.001) and wheezing (P = 0.022), a higher respiratory symptom score (P = 0.002), and a longer duration of hospital stay (P = 0.021) were observed in HBoV-positive children compared with the HBoV-negative group. Phylogenetic analysis showed all 187 HBoV-positive isolates were identified as HBoV 1, indicating minimal sequence variations among the isolates. A single lineage of HBoV 1 was found to have circulated in children with acute respiratory infections between 2010 and 2011 and was associated with several clinical characteristics including age, seasonality, and clinical severity with retraction, wheezing, and longer hospitalization. The clinical relevance of the minimal sequence variations of HBoV remains to be determined. J. Med. Virol. © 2014 Wiley Periodicals, Inc.
    Journal of Medical Virology 01/2014; · 2.37 Impact Factor
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    ABSTRACT: Purpose: The objective of this study was to find the predictors and generate a prediction scoring model of nonresponse to intravenous immunoglobulin in patients with Kawasaki disease. Methods: We examined 573 children diagnosed with KD at the Severance Children's Hospital between January 2009 and december 2012. We retrospectively reviewed their medical records. These patients were divided into 2 groups; the experimental group (N=433) and the validation group (N=140). Each group were divided into 2 groups the intravenous immunoglobulin nonresponders and the responders. Multivariate logistic regression analysis identified predictive factors of intravenous immunoglobulin nonresponders which make predictive scoring model. We practice internal validation and external validation. Results: Multivariate logistic regression analysis identified male, cervical lymphadenopathy, changes of the extremities, platelet, total bilirubin, alkaline phophatase, lactate dehydrogenase, C-reactive protein as significant predictors for nonresponse to intravenous immunoglobulin. We generated prediction score assigning 1 point for (1) male, (2) cervical lymphadenopathy, (3) changes of the extremities, (4) platelet (), (5) total bilirubin (), (6) alkaline phophatase (), (7) lactate dehydrogenase (), (8) C-reactive protein (>77.1 mg/dL). Using a cut-off point of 4 and more with this prediction score, we could identify the intravenous immunoglobulin nonresponder group. Sensitivity and specificity were 52.5% and 82.4% in experimental group and 37.8% and 81.8% in validation group, respectively. Conclusion: Our predictive scoring models had high specificity and low sensitivity in Korean patients. Therefore it is useful in predicting nonresponse to intravenous immunoglobulin with Kawasaki disease.
    Korean Journal of Pediatric Infectious Diseases. 01/2014; 21(1).
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    ABSTRACT: Metal fuel slugs of U–Zr alloys for a sodium-cooled fast reactor (SFR) have conventionally been fabricated using an injection casting method. However, casting alloys containing volatile radioactive constituents, such as Am, are problematic in a conventional injection casting method. As an alternative fabrication method, low pressure gravity casting has been developed. Casting soundness, microstructural characteristics, alloying composition, density, and fuel losses were evaluated for the following as-cast fuel slugs: U–10 wt% Zr, U–10 wt% Zr–5 wt% RE, and U–10 wt% Zr–5 wt% RE–5 wt% Mn. The U and Zr contents were uniform throughout the matrix, and impurities such as oxyen, carbon, and nitrogen satisfied the specification of total impurities less than 2,000 ppm. The appearance of the fuel slugs was generally sound, and the internal integrity was shown to be satisfactory based on gamma-ray radiography. In a volatile surrogate casting test, the U–Zr–RE–Mn fuel slug showed that nearly all of the manganese was retained when casting was done under an inert atmosphere.
    Journal of Radioanalytical and Nuclear Chemistry 01/2014; · 1.41 Impact Factor
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    ABSTRACT: Indium zinc tin oxide (IZTO) thin films with a nominal composition corresponding to In0.6Zn0.2Sn0.2O1.5 have been developed as an alternative material to indium tin oxide (ITO). Double layered, transparent, conducting ITO thin films were deposited on an IZTO film with 20 at% of each Sn and Zn using RF magnetron sputtering. ITO films were deposited on the IZTO film as a function of deposition time. The as-deposited double layered films were annealed using rapid thermal annealing at elevated temperatures under the following atmospheres: air, argon gas, and forming gas. The structural, electrical, and optical properties of the ITO/IZTO double layer films were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), Hall measurement, and UV-Visible-NIR spectrophotometry. The electrical resistivity of the films decreased owing to the ITO layers deposited on the IZTO thin film. Optimally, the electrical resistivity of double layered films was lowered to 2.9 × 10–4 Ω· cm after annealing in argon gas atmosphere with an ITO layer deposition time of 20 min.
    Journal of Nanoelectronics and Optoelectronics 12/2013; 8:498-503. · 0.48 Impact Factor
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    ABSTRACT: Background: Ciprofloxacin is not approved in children under 18 years old due to its potential musculoskeletal adverse effects. However, it is widely prescribed in the pediatric patients. We conducted a retrospective multicenter study to evaluate the prescription pattern of ciprofloxacin and to review any reported adverse events in Korean children. Methods: A retrospective review was performed in patients younger than 18 years old who received ciprofloxacin in 7 university hospitals in Korea from January 2006 to December 2011. Results: A total of 729 patients were identified. The median age was 15.9 years (range, 0.1-17.9); 18 patients (2.5%) were under 2 years old, 77 (10.6%) 2-9 years, 143 (19.6%) 10-14 years, and 491 (67.4%) 15-17 years. Two-hundred sixty-nine (36.9%) patients had comorbid medical conditions. Ciprofloxacin was given as the first-line antimicrobial agent in 480 (65.8%) patients. Clinical diagnoses at the time of ciprofloxacin prescription were gastroenteritis (325, 44.6%), urinary tract infections (159, 21.8%), abscess or skin and soft tissue infections (65, 8.9%) and pneumonia (55, 7.5%). There were 22 bacteremia cases (3.0%). Ciprofloxacin was prescribed mostly by emergency care physicians (207, 28.4%), internal medicine physicians (187, 25.7%) and pediatricians (153, 21.0%). The use of ciprofloxacin based on culture results was observed in only 26.1% of total patients (190/729); 43.8% by pediatricians vs. 21.4% by non-pediatric physicians (P<0.0001). Adverse events after use of ciprofloxacin were observed in 15 patients (2.1%): four with hypersensitivity, six with gastrointestinal complaints, one with headache, one with EKG abnormality and three others. There was no musculoskeletal complication reported. Conclusion: This is the first multicenter study to evaluate the prescription pattern and safety of ciprofloxacin in Korean children. We found that ciprofloxacin was frequently prescribed in children as an empiric antibiotic choice in many unapproved indications and musculoskeletal adverse event was not reported in any of these patients. There is a need for systematic monitoring for the appropriate use of ciprofloxacin and development of musculoskeletal complication in Korean children.
    IDWeek 2013 Meeting of the Infectious Diseases Society of America; 10/2013
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    ABSTRACT: Thermal cycling and melt reaction studies of ceramic coatings plasma-sprayed on Nb substrates were carried out to evaluate the performance of barrier coatings for metallic fuel casting applications. Thermal cycling tests of the ceramic plasma-sprayed coatings to 1450 °C showed that HfN, TiC, ZrC, and Y2O3 coating had good cycling characteristics with few interconnected cracks even after 20 cycles. Interaction studies by 1550 °C melt dipping tests of the plasma-sprayed coatings also indicated that HfN and Y2O3 do not form significant reaction layer between U-20 wt.% Zr melt and the coating layer. Plasma-sprayed Y2O3 coating exhibited the most promising characteristics among HfN, TiC, ZrC, and Y2O3 coating.
    Journal of Nuclear Materials 10/2013; 441(1-3):535-538. · 2.02 Impact Factor
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    ABSTRACT: This study was conducted to estimate the incidence of intrathyroid fat-containing lesions based in the general population on CT imaging. The imaging characteristics of the lesions on CT were also analyzed. This retrospective study included data for 1,205 patients who underwent neck CT at our institution from January 2012 to January 2013. Data concerning size, shape, homogeneity of attenuation and location of lesions, and the presence of a fatty band connecting to extrathyroid fat were evaluated. Pathologic specimens were reevaluated when available. A literature review was conducted based on 16 peer-reviewed articles describing intrathyroid fat-containing lesions. Intrathyroid fat-containing lesions were detected in 13 patients (1.2 %). The mean lesion size was 5.7 mm (range, 2.6-10.6 mm). Nodular shape (92 %), homogeneous attenuation (92 %), and the fatty band (77 %) were common CT features. Posterior (85 %), medial (85 %), and upper (92 %) aspects of the thyroid gland were most commonly involved. In four patients who underwent surgery, one had fat-containing nodular hyperplasia, one had ectopic thymic tissue within mature fat, and one had mature fat itself. In 16 previously reported studies, the 41 lesions presented two fat infiltration patterns, diffuse (n = 12) and localized (n = 29), and two lesions showed mature fat tissue itself. Intrathyroidal fat-containing lesions were found in 1.2 % of patients presenting for neck CT. Almost all of the lesions occurred in common locations and showed similar features on CT, including nodular shape, homogeneous attenuation, and a fatty band.
    Neuroradiology 09/2013; · 2.70 Impact Factor
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    ABSTRACT: There are different principles regarding varicella vaccination depending on social requirements. This study was performed to report a case of breakthrough chickenpox outbreak among a group of people in the healthcare center and also evaluate the seroprevalence of patients who have been managed with chronic neurological diseases in this center. We included patients diagnosed with varicella in April 2009 as an index cases and investigated the past history for chickenpox and the varicella-specific IgG. Sixty-two patients (children) and 156 healthcare workers who may have had possible contact with the index cases were also investigated for. We investigated the seroprevalence of 62 patients not affected by the outbreak. The varicella vaccination rate in children was 90.3%. Sixty-one point three percent of all patients were seropositive and 63.6% of these patients were aged between 12 and 23 months and 87.5% were aged between 24 and 35 months. Seropositive rate was decreased for patients aged between 36 and 59 months while the seropositive prevalence has increased for patients over 5 years old. Over 90% of the adults investigated were seropositive. IgG seronegative despite vaccination was 32.1% (18 persons). Breakthrough varicella outbreak can have huge impact in healthcare centers with affiliated group housing. We need to investigate vaccination status and immunogenicity according to ages and reflect appropriately on vaccination policy taking into consideration of social and medical requirements in the local area.
    Clinical and experimental vaccine research. 07/2013; 2(2):140-3.
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    ABSTRACT: Japanese encephalitis virus is a common cause of encephalitis in Asian children; therefore, maintenance of immunity against Japanese encephalitis virus is essential. Although many countries recommend booster vaccination, some trials have concluded that administration of one or two vaccinations is sufficient. The current study was conducted to evaluate immunogenicity and safety after a booster vaccination with live attenuated vaccine. For 68 study subjects, measurement of antibody titer was performed before and at 4-6 weeks after administration of a booster dose. Adverse reactions occurring at the injection site and systemic adverse reactions were documented. The percentages of subjects with seroprotective neutralizing antibody titers was 100% before and after booster vaccination, and the geometric mean titer increased after booster vaccination. Thus, we predict that immunity will be maintained for a long time by an amnestic response. Low percentages of adverse reactions indicated the safety of the immunizations.
    Journal of Tropical Pediatrics 06/2013; · 1.01 Impact Factor

Publication Stats

200 Citations
107.72 Total Impact Points

Institutions

  • 2011–2014
    • Korea Atomic Energy Research Institute (KAERI)
      Daiden, Daejeon, South Korea
  • 2009–2014
    • Yonsei University
      • Department of Pediatrics
      Sŏul, Seoul, South Korea
    • Yonsei University Hospital
      Sŏul, Seoul, South Korea
  • 2013
    • Yeungnam University
      • School of Materials Science and Engineering
      Onyang, South Chungcheong, South Korea
  • 2012
    • Korea University
      • Department of Radiology
      Seoul, Seoul, South Korea
    • Ewha Womans University
      Sŏul, Seoul, South Korea
  • 2010–2011
    • Seoul National University Bundang Hospital
      Sŏul, Seoul, South Korea
    • Seoul National University
      • College of Medicine
      Sŏul, Seoul, South Korea
  • 2008–2011
    • Seoul National University Hospital
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
    • CHA University
      • College of Medicine
      Seoul, Seoul, South Korea
  • 2008–2009
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi Province, South Korea