• 대한임상검사과학회지
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• 제51권2호
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• pp.164-170
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• 2019

5종류의 수송배지를 흡수 및 배출 능력, 생존 효율, 회수율을 CLSI (Clinical and Laboratory Standards Institute) M40-A2의 Swab elution method (Quantitative) 기준으로 평가하였다. 액체배지가 반유동 배지보다 3가지 평가에서 대부분 우수한 결과값을 보여주었다. Flocked swab이 standard swab 형태보다 균의 흡수 및 배출의 능력 또한 우수하였다. 생존 효율에 대한 평가 결과는 액체배지(S4)가 가장 우수한 결과값을 보였다. 성장이 좋지 않은 S. pneumoniae는 액체배지(S4, S5)에서 생존효율과 회수율이 높았다. 균 회수율 평가 결과는 S. pyogenes는 모든 배지에서 CLSI 기준에 적합하였다. S. pneumoniae는 반유동 배지(S2, S3)에서 부적합하였고, 나머지 배지는 모두 기준에 적합하였다. H. influenzae는 반유동 배지(S1, S3)에서 부적합하였고, 반유동 배지(S2), 액체배지(S4, S5)에서 기준에 적합하였다. 호흡기 질환을 유발하는 S. pneumonia, H. influenzae의 생존 능력은 대부분의 배지에서 좋지 않았다. P. aeruginosa는 실온에서 과성장이 관찰되었다. 액체배지와 flocked swab의 조합이 3가지 평가 방법에서 가장 뛰어난 결과를 평가를 통해 확인하였다.

• Molecules and Cells
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• 제26권2호
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• pp.206-211
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• 2008

HI0381 of Haemophilus influenzae was investigated by circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopy. HI0381 is a 153-residue peptidoglycan-associated outer membrane lipoprotein, and a part of the larger Tol/Pal network. Here, we report its backbone $^1H$, $^{15}N$, and $^{13}C$ resonance assignments, and secondary structure predictions. About 97% of all of the $^1HN$, $^{15}N$, $^{13}CO$, $^{13}C{\alpha}$, and $^{13}C{\beta}$ resonances covering 131 non-proline residues of the 134 residue, mature protein, were clarified by sequential and specific assignments. CSI and TALOS analyses revealed that HI0381 contains five ${\alpha}$-helices and five ${\beta}$-strands. To characterize the structure of HI0381, the effects of pH and salt concentration were investigated by CD. In addition, the structural changes occurring when HI0381 was in a membranous environment were investigated by comparing its HSQC spectra and CD data in buffer and in DPC micelles; the results showed that helix ${\alpha}4$ and strand ${\beta}4$ became aligned with the membrane. We conclude that the conformation of HI0381 is affected by the membrane environment, implying that its folded state is directly related to its function.

• Pediatric Infection and Vaccine
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• 제13권2호
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• pp.124-129
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• 2006

목 적 : 1996년부터 2005년까지 단일기관에서 발생한 세균성 수막염의 주요 원인균의 연령별 분포를 조사하였다. 방 법 : 1996년 1월부터 2005년 12월까지 세브란스병원 소아과에 입원하여 세균성 수막염이나 신생아 수막염으로 진단받은 환아들 중 뇌척수액 배양검사 및 라텍스응집반응검사에서 원인균이 확인된 증례들의 의무기록을 후향적으로 조사하였다. 결 과 : 원인균이 확인된 46례 중 신생아 수막염은 미숙아 4례를 포함하여 27례였고 신생아기 이후의 세균성 수막염은 19례였다. 신생아 수막염 환아 중 원인균이 혈액배양검사에서도 동정된 경우는 모두 15례(55.6%)였다. 신생아 수막염의 가장 흔한 원인균은 B군 연쇄상 구균이었다(44.4%). 또한 B군 연쇄상 구균에 의한 수막염의 75.0%가 지발형 감염이었다. 신생아기 이후의 세균성 수막염 환아들의 84.2%가 5세 미만에서 발생하여, 이들의 연령 중앙값은 23개월이었다. 신생아기 이후의 세균성 수막염의 원인균으로는 폐구균 8례(42.1%), 인플루엔자균 8례, 수막구균 3례 등이 있었으며, 이 중 인플루엔자균는 2001년 이후 최근 5년간 검출되지 않았다. 결 론 : 신생아 수막염의 가장 흔한 원인균은 B군 연쇄상 구균이고 신생아기 이후에는 폐구균과 인플루엔자균이 세균성 수막염의 가장 흔한 원인균이었다. 이 중 단백결합 백신의 도입으로 인플루엔자균에 의한 세균성 수막염은 감소되는 경향을 보였다.

• 한국동물위생학회지
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• 제36권4호
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• pp.333-340
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• 2013

Canine influenza virus (CIV) is an emerging pathogen that causes severe and acute respiratory disease in dogs. In 2006, the H3N2 CIV was first identified in dogs from Guangdong province in China. The nine isolates were grouped together with the canine H3N2 viruses isolated from dogs and cats in Korea. The possible interspecies transmission of influenza A virus is very important. We carried out a serological retrospective study using invited canine serum. The hospital invited 123 dogs, first vaccination group were revealed with CIV antibody positive rate of 81.8%. the second vaccination group were detected a positive rate of 91.2%. Antibody generation rate was higher in 3~10 years dogs. Protective antibody titers were detected from 2 weeks to 12 months. thereafter below the protective antibody. The results indicate that H3N2 CIV may have been consistently circulating in dog populations. Recently. These findings showed that H3N2 CIV has the capacity to replicate in and transmit among cohoused dogs and underscore the need for continued public health surveillance. Considering the result continuous management and prevention system against CIV is required at the concentrated animal care centers. The importance of CIV surveillance in this region for understanding the genesis of this virus, and it is important to remain aware of the potential of H3N2 CIV to be transmitted from dogs to the human population.

• Biotechnology and Bioprocess Engineering:BBE
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• 제9권6호
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• pp.490-494
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• 2004

An efficacy test of PRP (polyribosylribitol phosphate)-TT (Tetanus toxoid) conjugate vaccines was carried out using BALB/c mice as an animal model by inoculating Haemophilus in­fluenzae type b (Hib) with a virulence enhancement factor (VEF). Three administrations of the conjugate vaccines at 2-week intervals elicited a significantly high level of PRP antibodies (P>0.0001). The protective activity of the PRP immunization was challenged with either Hib with iron dextran (Hib/) or with a combination of mucin and hemoglobin (Hibmh) as a VEF. The me­dium lethal dose $(LD_{50})$ for Hibmh and Hibiwas measured as 10 CFU (Colony Forming Unit) and $2.5{\times}10^{8}$ CFU respectively. Each immunized animal was challenged with five or ten times the $LD_{50}$ level of bacteria with a VEF. A significant difference in mortality between the immunized and control mice (P> 0.01) was observed with the Hibmh challenge inoculation but not with the Hibi challenge inoculation. These results show that a combination of mucin and hemoglobin was able to enhance the virulence of Hib in BALB/c mice to cause a lethal infection, thus suggesting that BALB/c mice introduced to this method can be an effective model animal for testing the protective efficacy of H. influenzae conjugate vaccines.

• Journal of Microbiology and Biotechnology
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• 제28권10호
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• pp.1730-1735
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• 2018

Bacterial pneumonia is one of the most common causes of mortality in Korea. In 2016, the mortality rate from pneumonia was 16,476 deaths per 100,000, which was an 11% increase from the previous year. The aim of our study was to determine the distribution of the bacterial pathogens causing respiratory symptoms in different age groups over a 10-year period. Between January 2008 and September 2017, 1,861 specimens from 1,664 patients admitted to Dankook University Hospital with respiratory symptoms were examined. We used multiplex polymerase chain reaction (PCR) to detect six bacterial pneumonia pathogens: Bordetella pertussis, Chlamydophila pneumoniae, Haemophilus influenzae, Legionella pneumophila, Mycoplasma pneumoniae, and Streptococcus pneumoniae. We detected bacterial pneumonia pathogens in 1,281 (68.83%) specimens. Of the 1,709 pathogens detected, S. pneumoniae was the most common (48.57%; n = 830) followed by H. influenzae (40.08%; n = 685). Most infections were found among children younger than 10 years (92.69%; n = 1,584). Although S. pneumoniae was the most common pathogen detected in all age groups, M. pneumoniae infection increased in prevalence with age (p < 0.05). The rate of co-infection was also high among these patients (31.1%; n = 399), which peaked in 2015 (54.55%; n = 42/77). The prevalence of bacterial pneumonia in Cheonan, along with the proportion of co-infections among patients increased over the 10-year study period. The findings will aid the development of treatment and prevention guidelines.

• Pediatric Infection and Vaccine
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• 제16권1호
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• pp.13-23
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• 2009

Acute otitis media (AOM) and pneumonia are among the most common infectious diseases of children. Both are mucosal infections and share many common features such as etiological agents, pathogenesis and immunity. Influenza plays an important role in the pathogenesis of AOM and pneumonia. A vaccine against influenza may have substantial impact on these diseases during the influenza season. In clinical trials, influenza vaccine has reduced the incidence of AOM and pneumonia complicating influenza in children. However, the efficacy of vaccines has been controversial in children less than 2 years of age. Similarly, vaccines against Streptococcus pneumoniae and Haemophilus influenzae type b (Hib), both common causes of AOM and pneumonia, have the potential to reduce the impact of disease. Clinical trials showed that the currently licensed 7-valent pneumococcal conjugate vaccine (PCV), administered during infancy, had an efficacy of 6-7% for the prevention of AOM, however, visits to the clinic for AOM were reduced by up to 20-30% after routine use in the U.S. Both Hib and PCVs have a proven effectiveness of >20% for prevention of radiologically confirmed pneumonia in children. The recently introduced pnuemococcal vaccine conjugated with protein D is expected to reduce AOM and pneumonia caused by non-typable H. influenzae, in addition to its effects on pneumococcal diseases. Considering their high incidence in children, recent achievements in the prevention of AOM and pneumonia with vaccines may have a significant economic and social impact.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.151-152
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• 2002

Bacterial infection is a very complex process in which both pathogenic microorganisms and host cells play crucial roles, and it is the outcome of interactions between the two participants. To elucidate the bacterial pathogenesis mechanisms, therefore, it is essential to understand the cellular and systemic responses of the host as well as the virulence factors of the pathogen. Infection of a host by pathogenic bacteria causes drastic changes in the physiology of host cells, leading to activation of a program of various gene expression. (omitted)

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1996년도 제4회 추계심포지움
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• pp.65-73
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• 1996

LPS/LOS, the compound found only in gram-negative bacterial outer membrane, plays important roles in bacterial maintenance as well as its pathogenesis. We isolated and characterized several genes required for NTHi 2019 LOS biosynthesis, which encode enzymes required for sugar substrate synthesis or the transfer of substrates to receptor molecules. The htrB gene, however, appears to have more complex role. It has acryltransferase activity as well as various other activity, which may control regulation of LOS biosynthesis as well as its pathogenicity. Evidences supporting the latter come from the observations that the lipid A of the B29 induced significantly less TNF ${\alpha}$ from macrophages than that of the wild type LOS (unpublished data). H. influenzae A2-htrB mutant strain was also significantly less invasive than the wild type strain. The structural similarities of the enterobacterial LPS and the Haemophilus LOS enabled us to isolate the NTHi 2019 genes involved in LOS biosynthesis genes by using the S. typhimurium LPS deep core mutants. While a similar approach has been used for E. coli, this technique for selection of an LPS phenotype has not been applied to nonenterobacterial species. The difficulties inherent in the molecular manipulation of organism such as Neisseria and Haemophilus species make this approach particularly attractive in the identification and cloning LOS genes. Studies on genetic features of LPS/LOS biosynthesis would be useful for understanding bacterial pathogenesis as well as for developing vaccines for these gram-negative pathogenic bacteria.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.315.3-316
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• 2002

A universal set of genes encodes the components of dissociated. type II. fa11y acid synthase system that is responsible for producing the multitude of fa11y acid structures found in bacterial membranes. We examined the biochemical basis for the production of fatty acids by bacteria. Several genes from HaemophHus influenzae Rd and three genes from Enterococcus faecalis V583 were predicted to encode homologs of the ${\beta}$-ketoacyl-acyl carrier protein synthases I or II or III of Escherichia coli(FabB or BabF, or FabH)were identified in the genomic database. The protein products were expressed. purified, and biochemically characterized. efFabH and hF abH carried out the initial condensation reaction of fatty acid biosynthesis with acetyl-Coenzyme A as a primer. and hFabB and efFabF1 carried out the elongation condensation reaction of fatty acid biosynthesis with myrixtoyl-ACP.