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Susceptibility of Human H3N2 Influenza Virus to Oseltamivir in South Korea, 2009–2011
박세희,김진일,이일섭,이상무,황민웅,배준용,허준,임은주,석원석,정희진,송준영,김우주,박만성 한국미생물학회 2012 The journal of microbiology Vol.50 No.6
During the 2009–2011 influenza seasons, 10.26% of the specimens isolated from patients in South Korea were subtyped as H3N2 viruses. Some oseltamivir-sensitive H3N2 samples exhibited different plaque morphologies, and were found to have novel mutations in the neuraminidase gene. In a subsequent analysis using NA mutant viruses, viral compensation against oseltamivir treatment was observed only in the N2 mutant virus. All things considered, these novel mutations may account for the exclusive characteristics of selected H3N2 viruses observed in plaque reduction assays.
류지형,권민석,문정대,황민웅,이정민,박기현,윤소정,배현진,최애란,이혜영,정봉수,정주희,한경자,김용구,오은지 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.6
Background: Accurate, rapid, and cost-effective screening tests for hepatitis B virus (HBV) and hepatitis C virus (HCV) infection may be useful in laboratories that cannot afford automated chemiluminescent immunoassays (CLIAs). We evaluated the diagnostic performance of a novel rapid automated fluorescent lateral flow immunoassay (LFIA). Methods: A fluorescent LFIA using a small bench-top fluorescence reader, Automated Fluorescent Immunoassay System (AFIAS; Boditech Med Inc., Chuncheon, Korea), was developed for qualitative detection of hepatitis B surface antigen (HBsAg), antibody to HBsAg (anti-HBs), and antibody to HCV (anti-HCV) within 20 minutes. We compared the diagnostic performance of AFIAS with that of automated CLIAs—Elecsys (Roche Diagnostics GmbH, Penzberg, Germany) and ARCHITECT (Abbott Laboratories, Abbott Park, IL, USA)—using 20 seroconversion panels and 3,500 clinical serum samples. Results: Evaluation with the seroconversion panels demonstrated that AFIAS had adequate sensitivity for HBsAg and anti-HCV detection. From the clinical samples, AFIAS sensitivity and specificity were 99.8% and 99.3% for the HBsAg test, 100.0% and 100.0% for the anti-HBs test, and 98.8% and 99.1% for the anti-HCV test, respectively. Its agreement rates with the Elecsys HBsAg, anti-HBs, and anti-HCV detection assays were 99.4%, 100.0%, and 99.0%, respectively. AFIAS detected all samples with HBsAg genotypes A-F and H and anti-HCV genotypes 1, 1a, 1b, 2a, 2b, 4, and 6. Cross-reactivity with other infections was not observed. Conclusions: The AFIAS HBsAg, anti-HBs, and anti-HCV tests demonstrated diagnostic performance equivalent to current automated CLIAs. AFIAS could be used for a large-scale HBV or HCV screening in low-resource laboratories or low-to middle-income areas.
DBA/2 Mouse as an Animal Model for Anti-influenza Drug Efficacy Evaluation
김진일,박세희,이상무,이일섭,허준,황민웅,배준용,김동환,장석일,박미숙,박만성 한국미생물학회 2013 The journal of microbiology Vol.51 No.6
Influenza viruses are seasonally recurring human pathogens. Vaccines and antiviral drugs are available for influenza. However, the viruses, which often change themselves via antigenic drift and shift, demand constant efforts to update vaccine antigens every year and develop new agents with broad-spectrum antiviral efficacy. An animal model is critical for such efforts. While most human influenza viruses are unable to kill BALB/c mice, some strains have been shown to kill DBA/2 mice without prior adaptation. Therefore, in this study, we explored the feasibility of employing DBA/2mice as a model in the development of anti-influenza drugs. Unlike the BALB/c strain, DBA/2 mice were highly susceptible and could be killed with a relatively low titer (50%DBA/2 lethal dose = 102.83 plaque-forming units) of the A/Korea/01/2009 virus (2009 pandemic H1N1 virus). When treated with a neuraminidase inhibitor, oseltamivir phosphate,infected DBA/2 mice survived until 14 days postinfection. The reduced morbidity of the infected DBA/2mice was also consistent with the oseltamivir treatment. Taking these data into consideration, we propose that the DBA/2 mouse is an excellent animal model to evaluate antiviral efficacy against influenza infection and can be further utilized for combination therapies or bioactivity models of existing and newly developed anti-influenza drugs.
The Anti-influenza Virus Effect of Phellinus igniarius Extract
이상무,김진일,허준,이일섭,박세희,황민웅,배준용,박미숙,박형진,박만성 한국미생물학회 2013 The journal of microbiology Vol.51 No.5
Herbal medicine has been used in the orient for thousands of years to treat large and small ailments, including microbial infections. Although there are treatments for influenza virus infection, there is no treatment for drug-resistant viruses. It is time that we explored and exploited the multicomponent nature of herbal extracts as multi-drug combination therapies. Here, we present data on the anti-influenza virus effect of a medicinal mushroom, Phellinus igniarius. The P. igniarius water extract was effective against influenza A and B viruses, including 2009 pandemic H1N1, human H3N2, avian H9N2, and oseltamivir-resistant H1N1 viruses. Virological assays revealed that the extract may interfere with one or more early events in the influenza virus replication cycle, including viral attachment to the target cell. Therefore, our results provide new insights into the use of P. igniarius as an anti-influenza medicine.
GFP-Expressing Influenza A Virus for Evaluation of the Efficacy of Antiviral Agents
김진일,박세희,이일섭,이상무,신샘,원용관,황민웅,배준용,허준,현혜은,전혜진,임순성,박만성 한국미생물학회 2012 The journal of microbiology Vol.50 No.2
To address its value as a screening tool in the development of antiviral drugs, a recombinant influenza virus expressing green fluorescent protein (rPR8-GFP virus) was investigated in vitro and in vivo. The inhibition of viral growth by a neuraminidase inhibitor in the cells or lower respiratory tracts of mice could be visualized by the level of fluorescence. In addition, the rPR8-GFP virus exhibited high pathogenicity in mice. Taken together, these results suggest that the rPR8-GFP virus can be a useful tool for the rapid identification of antiviral drugs active against influenza viruses.