• Pediatric Infection and Vaccine
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• 제17권2호
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• pp.130-136
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• 2010

목적 : 부산에서 급성호흡기 증상으로 외래 방문한 환자를 대상으로 원인 바이러스 및 역학을 연구하고자 하였다. 방법 : 2007년 1월부터 2008년 12월까지 3개 병원 소아청소년과 외래에 급성 호흡기 증상을 주소로 내원한 990명을 대상으로, 비강 세척법으로 검체를 채취하여 역전사중합효소연쇄반응을 시행하였다. 결과 : 총 검체 990건 중 351건(35.5%)이 검출되었으며, 남녀 비는 1.6대 1이었고, 5세 이하가 93.7%였다. hRV가 가장 흔한 원인으로 연중 202건(57.5%), 그 다음으로는 RSV로 10월부터 3월까지 57건(16.2%), ADV는 연중 37건(10.5%), INF는 12월부터 4월까지 21건(6%), hBoV는 1월부터 8월까지 15건(4.3%), PIV는 4월부터 7월까지 9건(2.6%), hCoV는 1월부터 7월까지 7건(2%), EV는 6월부터 9월에 3건(0.9%) 검출되었다. 결론 : 본 연구는 부산의 소아급성호흡기 질환을 예방하고 치료하는데 도움이 되고자 하며, 앞으로도 원인 바이러스에 대한 지속적인 연구가 필요하다.

• Journal of Microbiology and Biotechnology
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• 제25권12호
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• pp.2146-2152
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• 2015

Apios americana Medik (hereinafter Apios) has been reported to treat diseases, including cancer, hypertension, obesity, and diabetes. The therapeutic effect of Apios is likely to be associated with its anti-inflammatory activity. This study was conducted to evaluate the protective effects of Apios in animal models of acute lung injury induced by lipopolysaccharide (LPS) or pandemic H1N1 2009 influenza A virus (H1N1). Mice were exposed to LPS or H1N1 for 2-4 days to induce acute lung injury. The treatment groups were administered Apios extracts via oral injection for 8 weeks before LPS treatment or H1N1 infection. To investigate the effects of Apios, we assessed the mice for in vivo effects of Apios on immune cell infiltration and the level of pro-inflammatory cytokines in the bronchoalveolar lavage (BAL) fluid, and histopathological changes in the lung. After induction of acute lung injury, the numbers of neutrophils and total cells were lower in the Apios-treated groups than in the non-Apios-treated LPS and H1N1 groups. The Apios groups tended to have lower levels of tumor necrosis factor-a and interleukin-6 in BAL fluid. In addition, the histopathological changes in the lungs were markedly reduced in the Apios-treated groups. These data suggest that Apios treatment reduces LPS- and H1N1-induced lung inflammation. These protective effects of Apios suggest that it may have therapeutic potential in acute lung injury.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.316-321
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• 2022

Since 2019, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread rapidly, infecting millions of people worldwide. On March 11, 2020, the World Health Organization declared coronavirus disease (COVID-19) a pandemic owing to the worldwide spread of SARS-CoV-2, which created an unprecedented burden on the global healthcare system. In this context, there are increasing concerns regarding co-infections with other respiratory viruses, such as the influenza virus. In this study, clinical data of patients infected with SARS-CoV-2 and other respiratory viruses were compared with patients infected with SARS-CoV-2 alone. The hematology and blood biochemistry results of 178 patients infected with SARS-CoV-2 , who were tested on admission, were retrospectively reviewed. In patients with SARS-CoV-2 and adenovirus co-infection, C-reactive protein levels were elevated on admission, whereas lactate dehydrogenase (LDH), prothrombin time, international normalized ratio, activated partial thromboplastin clotting time, and bilirubin values were all within the normal range. Moreover, patients with SARS-CoV-2 and human bocavirus co-infection had low LDH and high bilirubin levels on admission. These findings reveal the clinical features of respiratory virus and SARS-CoV-2 co-infections and support the development of appropriate approaches for treating patients with SARS-CoV-2 and other respiratory virus co-infections.

• Pediatric Infection and Vaccine
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• 제18권2호
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• pp.193-200
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• 2011

목 적: 2009년에 신종 인플루엔자 바이러스에 감염이 되어 본원에 입원한 폐렴 환자들 중 호흡곤란을 보여 중증 폐렴으로 진행한 환자에서 조기에 스테로이드 치료를 하였던 37명의 임상적 특성, 검사실 소견, 치료결과를 보고하고자 한다. 방 법: 2009년 10월 1일부터 12월 31일까지 창원 파티마병원에 기침과 발열 등으로 입원한 환자 중 입원시 및 입원 중 호흡곤란을 보여 조기 스테로이드 치료를 받은 환자 37명을 대상으로 하였다. 환자들은 모두 방사선 검사에서 폐렴이 확인되었고, 신종 인플루엔자 진단을 위하여 실시간 역전사효소 중합반응(RT-PCR) 검사와 신속항원검사를 받았으며, 모두 RT-PCR에서 양성을 보였다. 대상 환자들의 의무기록과 방사선 소견을 후향적으로 분석하였다. 결 과:대상 환자 37명의 평균 연령은 $6.5{\pm}2.9$세(2-16세)이었고, 남아 29명, 여아 8명(남녀비=3.4:1)이었다. 입원 전 평균 발열일은 $1.4{\pm}0.6$일(4시간-3일)이었으며, 발열과 기침을 보인 후 호흡곤란이 발생하기까지 걸린 시간이 평균 $9.6{\pm}3.5$시간(1-24시간)이었다. 대상환자 37명중 13명(35.1%)은 항바이러스제(oseltamivir)를 투여 받는 중 호흡곤란이 심해져서 스테로이드 치료를 받았다. 스테로이드 치료로는 모든 환자에 대해 정맥용 메틸프레드니솔론을 체중(kg) 당 8-10 mg/일 용량으로 하루에 4회 나누어 정맥으로 투여하였고, 호흡곤란이 없어진 후 바로 스테로이드 투여를 중지하였다. 평균 투여일은 $1.9{\pm}0.5$일(1-3일)이었다. 모든 환자들이 합병증 없이 퇴원하였으며 퇴원 후 폐렴의 후유증으로 재입원한 환자는 없었다. 결 론 : 신종 인플루엔자 바이러스 폐렴 환자들의 일부는 발병 초기에 호흡곤란을 보이는 중증 폐렴으로 빠르게 진행하였고 조기 스테로이드 치료가 임상적 증상 및 방사선 소견의 빠른 호전을 가져왔다. 따라서 향후 스테로이드제 및 항바이러스제의 중증 폐렴 환자에 대한 효과 판정을 위한 전향적 대조 임상 연구가 필요하다.

• Journal of Microbiology and Biotechnology
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• 제25권2호
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• pp.280-287
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• 2015

Current influenza vaccines are produced in embryonated chicken eggs. However, egg-based vaccines have various problems. To address these problems, recombinant protein vaccines have been developed as new vaccine candidates. Unfortunately, recombinant proteins frequently encounter aggregation and low stability during their biogenesis. It has been previously demonstrated that recombinantly expressed proteins can be greatly stabilized with high solubility by fusing stabilizing peptide (SP) derived from the C-terminal acidic tail of human synuclein (ATS). To investigate whether SP fusion proteins can induce protective immunity in mice, we produced influenza HA and SP fusion protein using a baculovirus expression system. In in vitro tests, SP-fused recombinant HA1 (SP-rHA1) was shown to be more stable than recombinant HA1 (rHA1). Mice were immunized intramuscularly with baculovirus-expressed rHA1 protein or SP-rHA1 protein ($2{\mu}g/mouse$) formulated with aluminum hydroxide. Antibody responses were determined by ELISA and hemagglutination inhibition assay. We observed that SP-rHA1 immunization elicited HA-specific antibody responses that were comparable to rHA1 immunization. These results indicate that fusion of SP to rHA1 does not negatively affect the immunogenicity of the vaccine candidate. Therefore, it is possible to apply SP fusion technology to develop stable recombinant protein vaccines with high solubility.

• Tuberculosis and Respiratory Diseases
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• 제72권6호
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• pp.493-500
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• 2012

Background: This study investigated the clinical characteristics and risk factors of the severity of pandemic influenza A (H1N1) 2009 infection in pediatric patients in Busan and Gyeongsangnam-do. Methods: Cases of influenza A (H1N1) 2009 in patients under the age of 18 years, confirmed by reverse transcription polymerase chain reaction, at Pusan National University Hospital and Pusan National University Yangsan Hospital from the last week of August 2009 through the last week of February 2010 were retrospectively analyzed. Results: Of the 3,777 confirmed cases of influenza A (H1N1) 2009, 2,200 (58.2%) were male and 1,577 (41.8%) were female. The average age of the patients was $8.4{\pm}4.8$ years. The total cases peaked during 44th to 46th week. Most of the patients were in the 5- to 9-year-old age group. Oseltamivir was administered to 2,959 (78.3%) of the patients. 221 patients (5.9%) were hospitalized, age an average of $6.7{\pm}4.5$ years. The average duration of hospitalization was $7.4{\pm}5.6$ days. One hundred cases (45.2%) had pneumonia. Risk factors for hospitalization included male gender, <2 years of age, and underlying disease. Children with asthma were at very high risk of hospitalization, over 20 times the non-asthmatic children (odds ratio [OR], 21.684; confidence interval [CI], 13.295~39.791). Likewise the children with neurologic deficits faced a 16 times higher risk (OR, 15.738; CI, 7.961~31.111). Ten of the patients (4.5%) were admitted to the intensive care unit, and eight (3.6%) required mechanical ventilation. Conclusion: Of the pediatric patients with pandemic influenza A (H1N1) 2009, most of the patients were in the 5- to 9-year-old age group. Risk factors for hospitalization included male gender, <2 years of age, and underlying disease. The most common complication was pneumonia. The very high risk of severe morbidity in children with asthma or neurologic disease shows the critical importance of targeted vaccine coverage, special awareness and swift care by both guardians and primary care providers.

• Journal of Microbiology and Biotechnology
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• 제31권7호
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• pp.942-948
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• 2021

Canine influenza virus (CIV) induces acute respiratory disease in dogs. In this study, we aimed to determine the signaling pathways leading to the induction of IFN-β in a canine respiratory epithelial cell line (KU-CBE) infected with the H3N2 subtype of CIV. Small interfering RNAs (siRNAs) specific to pattern recognition receptors (PRRs) and transcription factors were used to block the IFN-β induction signals in H3N2 CIV-infected KU-CBE cells. Among the PRRs, only the TLR3 and RIG-I expression levels significantly (p < 0.001) increased in CIV-infected cells. Following transfection with siRNA specific to TLR3 (siTLR3) or RIG-I (siRIG-I), the mRNA expression levels of IFN-β significantly (p < 0.001) decreased, and the protein expression of IFN-β also decreased in infected cells. In addition, co-transfection with both siTLR3 and siRIG-I significantly reduced IRF3 (p < 0.001) and IFN-β (p < 0.001) mRNA levels. Moreover, the protein concentration of IFN-β was significantly (p < 0.01) lower in cells co-transfected with both siTLR3 and siRIG-I than in cells transfected with either siTLR3 or siRIG-I alone. Also, the antiviral protein MX1 was only expressed in KU-CBE cells infected with CIV or treated with IFN-β or IFN-α. Thus, we speculate that IFN-β further induces MX1 expression, which might suppress CIV replication. Taken together, these data indicate that TLR3 and RIG-I synergistically induce IFN-β expression via the activation of IRF3, and the produced IFN-β further induces the production of MX1, which would suppress CIV replication in CIV-infected cells.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.277.1-277.1
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• 2013

Molecular diagnostics consists of three processes, which are a sample pretreatment, a nucleic acid amplification, and an amplicon detection. Among three components, sample pretreatment is an important process in that it can increase the limit of detection by purifying nucleic acid in biological sample from contaminants that may interfere with the downstream genetic analysis such as nucleic acid amplification and detection. To achieve point-of-care virus detection system, the sample pretreatment process needs to be simple, rapid, and automatic. However, the commercial RNA extraction kits such as Rneasy (Qiagen) or MagnaPure (Roche) kit are highly labor-intensive and time-consuming due to numerous manual steps, and so it is not adequate for the on-site sample preparation. Herein, we have developed a rotary microfluidic system to extract and purify the RNA without necessity of external mechanical syringe pumps to allow flow control using microfluidic technology. We designed three reservoirs for sample, washing buffer, and elution buffer which were connected with different dimensional microfluidic channels. By controlling RPM, we could dispense a RNA sample solution, a washing buffer, and an elution buffer successively, so that the RNA was captured in the sol-gel solid phase, purified, and eluted in the downstream. Such a novel rotary sample preparation system eliminates some complicated hardwares and human intervention providing the opportunity to construct a fully integrated genetic analysis microsystem.

• Tuberculosis and Respiratory Diseases
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• 제70권5호
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• pp.397-404
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• 2011

Background: To evaluate chest CT findings of pandemic influenza A/H1N1 pneumonia without co-infection. Methods: Among 56 patients diagnosed with pandemic influenza A/H1N1 pneumonia, chest CT was obtained in 22 between October 2009 and Februrary 2010. Since two patients were co-infected with bacteria, the other twenty were evaluated. Predominant parenchymal patterns were categorized into consolidation, ground glass opacity (GGO), and mixed patterns. Distribution of parenchymal abnormalities was assessed. Results: Median age was 46.5 years. The CURB-65 score, which is the scoring system for severity of community acquired pneumonia, had a median of 1. Median duration of symptoms was 3 days. All had abnormal chest x-ray findings. The median number of days after the hospital visit that Chest CT was performed was 1. The reasons for chest CT performance were radiographic findings unusual for pneumonia (n=13) and unexplained dyspnea (n=7). GGO was the most predominant pattern on CT (n=13, 65.0%). Parenchymal abnormalities were observed in both lungs in 13 cases and were more extensive in the lower lung zone than the upper. Central and peripheral distributions were identified in ten and nine cases, respectively. One showed diffuse distribution. Peribronchial wall thickening was found in 16 cases. Centrilobular branching nodules (n=7), interlobular septal thickening (n=4), atelectasis (n=1), pleural effusion (n=5), enlarged hilar and mediastinal lymph nodes (n=6 and n=7) were also noted. Conclusion: Patchy and bilateral GGO along bronchi with predominant involvement of lower lungs are the most common chest CT findings of pandemic influenza A/H1N1 pneumonia.

• Pediatric Infection and Vaccine
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• 제24권1호
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• pp.16-22
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• 2017

목적: 인플루엔자 A형과 B형의 임상 양상이나 항바이러스제에 대한 치료반응에 차이가 있을 것이라는 가정에 따라 본 연구를 시행하였다. 방법: 2013년 10월부터 2015년 5월까지 인플루엔자 감염으로 동국대학교 일산병원에 입원한 환자를 대상으로 인플루엔자 임상 양상, oseltamivir의 복용 시간 및 인플루엔자 유형에 따른 치료반응의 차이를 조사하였다. 결과: 총 환자는 138명(남 69명, 여 69명)이고 평균 나이는 $3.5{\pm}4.0$세였다. 동반 질환으로 A형에서는 크룹(19.2% vs. 1.7%, P=0.001)이, B형에서는 근육염(0% vs. 6.7%, P=0.021)과 장염(29.5% vs. 46.7%, P=0.038)이 더 자주 발병하였다. Oseltamivir의 투약 시점과 투약 후 발열 시간을 비교하면 열 발생 2일 이내 투약한 환자군이 다른 군에 비해 전체 발열 기간이 유의하게 짧았다. Oseltamivir 복용 후 발열이 지속된 시간은 A형이 $16.0{\pm}19.1$시간, B형이 $28.9{\pm}27.9$시간으로 A형의 발열이 더 빨리 호전되었다(P=0.006). 결론: 인플루엔자는 A형과 B형에 있어서 동반되는 질환과 항바이러스제의 치료반응은 차이가 있을 수 있으며, oseltamivir 투약은 열 발생 2일 이내에 복용하는 것이 중요하다.