• Pediatric Infection and Vaccine
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• 제23권3호
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• pp.194-201
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• 2016

Purpose: Monitoring pneumococcal carriage rates is important. We developed and evaluated the accuracy of a real-time reverse transcription polymerase chain reaction (RT-PCR) protocol for the detection of Streptococcus pneumoniae. Methods: In October 2014, 157 nasopharyngeal aspirates were collected from patients aged <18 years admitted to Chung-Ang University Hospital. We developed and evaluated a real-time PCR method for detecting S. pneumoniae by comparing culture findings with the results of the real-time PCR using genomic DNA (gDNA). Of 157 samples, 20 specimens were analyzed in order to compare the results of cultures, real-time PCR, and real-time RT-PCR. Results: The concordance rate between culture findings and the results of real-time PCR was 0.922 (P<0.01, Fisher exact test). The 133 culture-negative samples were confirmed to be negative for S. pneumoniae using real-time PCR. Of the remaining 24 culture-positive samples, 21 were identified as S. pneumonia -positive using real-time PCR. The results of real-time RT-PCR and real-time PCR from 20 specimens were consistent with culture findings for all S. pneumoniae -positive samples except one. Culture and real-time RT-PCR required 26.5 and 4.5 hours to perform, respectively. Conclusions: This study established a real-time RT-PCR method for the detection of pneumococcal carriage in the nasopharynx. Real-time RT-PCR is an accurate, convenient, and time-saving method; therefore, it may be useful for collecting epidemiologic data regarding pneumococcal carriage in children.

• Childhood Kidney Diseases
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• 제6권1호
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• pp.56-60
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• 2002

Purpose Streptococcus pneumoniae is a major pathogen in both adults and children, causing significant morbidity and mortality In patients with nephrotic syndrome, Streptococcus pneumoniae is a major cause of spontaneous peritonitis, and the increasing incidence of penicillin-resistance strain facilitates the development of effective vaccine. The limitation of current pneumococcal polysaccharide vaccine prompted development of polysaccharide- protein conjugate vaccine. Methods: We reviewed the medical record of total 225 steroid responsive nephrotic patients to ascertain the effectiveness of 23- valent pneumococcal polysaccharide vaccine. Results. Twenty- eight patients have developed peritonitis during the courses, and 7 of those have recurrent peritonitis. Fifty- five patients were vaccinated and followed- up for 1- 108 months (mean 38.5 months), and during the follow- up period, pneumococcus related peritonitis was not detected. Vaccine- related relapse of nephrotic syndrome w as absent. Conclusion: In spite of the non- consensus about the efficacy of PPV23, clinically it benefits, and until the clinical trial of PCV7 is completed, PPV23 will be recommended. (J Korean Soc Pediatr Nephrol 2002;6: 56-60)

• Clinical and Experimental Pediatrics
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• 제48권1호
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• pp.40-47
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• 2005

Purpose : S. pneumoniae is one of major pathogens of community-acquired respiratory infections. The rate of antibiotic resistance to this organism has increased, and resistance to multiple antimicrobial agents in a single strain of S. pneumoniae may compromise the efficacy of empiric antimicrobial treatment commonly used for respiratory infections. We did this study to find out the penicillin resistant distributions and oral antibiotics susceptibility patterns against S. pneumoniae, isolated from pediatric patients with community-acquired respiratory infections in Korea. Methods : One hundred fifty six pneumococcal isolates obtained from pediatric patients with community-acquired respiratory infections such as acute otitis media(AOM), sinusitis and pneumonia between May 2000 to June 2003. And MICs of penicillin and oral antibiotics(amoxicillin, amoxicillin-clavulanate, cefaclor) were performed by broth microdilution methods according to the NCCLS(2003a). Results : Seventy eight percent of the isolates were resistant to penicillin. The isolates, collected from AOM patients showed the highest penicillin resistance(92.7%). The resistant rates of amoxicillin (16.7%) and amoxicillin-clavulanate(9.6%), based on susceptibility breakpoints established by the NCCLS, were markedly lower than these of penicillin. But, the resistant rate of cefaclor was very high, above 95%. Conclusion : We concluded that pneumococci isolated from study cases may be one of the world's highest penicillin resistant rates. But, amoxicillin and amoxicillin-clavulanate can be used as a first-line antibiotics. Finally, we hope that a continuous surveillance study to monitor resistant patterns of pneumococcal respiratory infections will be needed for the standard guidelines of empiric antibiotic treatment.

• The Monthly Diabetes
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• 통권240호
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• pp.14-16
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• 2009

인슐린과 항생제가 만들어지기 전에는 당뇨병환자들은 여러 가지 감염, 특히 폐렴으로 인한 입원과 사망률이 높았었다. 당뇨병환자들은 면역기능이 감소되어 있어서 당뇨병이 없는 환자들에 비하여 호흡기 감염이 여전히 더 잘 생길 수 있고 입원률과 사망률도 일반인에 비하여 더 높다. 우리나라의 중요한 호흡기 감염질환은 폐렴과 폐결핵이다. 이 2가지 질환과 당뇨병과의 관계 및 당뇨병환자에서 독감과 폐렴구균에 대한 예방접종의 효과와 필요성에 대하여 알아보자.

• Journal of Life Science
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• 제33권2호
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• pp.158-168
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• 2023

Natural products have been used to mitigate the effects of cancer and infectious diseases, as they feature diverse bioactivities, such as antioxidant, antibacterial, anti-inflammatory, and immunomodulatory effects. Here, we chose 10 natural products that are well-known as pulmonary enhancers and investigated their bactericidal effects on Streptococcus pneumoniae. In the disk diffusion assay, the growth of S. pneumoniae was significantly regulated by G. fructus treatment regardless of extraction method used. We first adopted spraying as a novel delivery method for G. fructus. Interestingly, mice exposed to G. fructus three times a day for 2 weeks were resistant to S. pneumoniae intranasal infection (shown both through body weight loss and survival rates compared to the control group). Moreover, we confirmed that exposure to G. fructus regulated the colonization of the bacteria despite the sustained inflammation in the lung after exposure to S. pneumoniae, indicating that migrated inflammatory immune cells may involve a host defense mechanism against pulmonary infectious diseases. While a similar number of granulocytes (CD11b⁺Ly6C⁺Ly6G⁺), neutrophils (CD11b⁺Ly6C^intLy6G⁺), and monocytes (CD11b⁺Ly6C^intLy6G^-) were found between groups, a significantly increased number of alveolar macrophages (CD11b⁺CD11c^hiF4/80⁺) was detected in BAL fluids of mice pre-exposed to G. fructus at 5 days after S. pneumonia infection. Taken together, our data suggest that this usage of G. fructus can induce protective immunity against bacterial infection, indicating that facial spray may be helpful in enhancing the defense mechanism against pulmonary inflammation and in evaluating the efficacy of natural products as immune enhancers against respiratory diseases.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 한국염색가공학회 2008년도 제38차 학술발표대회
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• pp.144-146
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• 2008

첨단과학기술의 발달로 환경오염이나 자연파괴 등을 유발시킴으로써 이에 부응하여 다양한 기능이 부여된 소재들이 개발 되고 있어 천연성분을 이용한 패션상품들이 고부가치를 창출하고 있다. 본 실험에서는 Kumazasa를 충분히 건조시켜 키토산을 젖산 수용액에 용해시켜 면을 처리 하고 욕비 1:10으로 Kumazasa를 24시간 80$^{\circ}C$에 가열하여 얻은 추출액으로 염색하여 수세 및 건조하였다. 항균성은 황색포도당구균과 폐렴구균에 대한 항균성을 조사한 결과 모두 99.9%로 매우 우수한 항균성이 나타났다.

• Clinical and Experimental Pediatrics
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• 제52권4호
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• pp.508-511
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• 2009

Streptococcus pneumoniae is a major cause of serious invasive diseases in children, especially in young infants, but seven- valent pneumococcal conjugate vaccine (PCV7) is believed to prevent invasive pneumococcal pneumonia and meningitis in young children. However, recently, the incidence of non-PCV7 serotype has increased after PCV7 vaccination. A 14-month- old female patient presented at our emergency room with mental change and lethargy. Three days previously, she had developed fever and vomiting. After being admitted, she rapidly progressed to coma and brain death despite prompt and extensive supportive treatment. She expired 20 days after admission with a final diagnosis of pneumococcal 19A (non-PCV7 serotype) meningoencephalitis despite having received PCV7 ($Prevenar^{(R)}$) vaccinations on three occasions. The author reports this first fatality due to pneumococcal 19A meningoencephalitis in Korea and provides a brief review of the literature.

• Pediatric Infection and Vaccine
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• 제15권2호
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• pp.206-211
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• 2008

Streptococcus pneumoniae is a common cause of acute otitis media, sinusitis, pneumonia, and the invasive bacterial infections in children. Rarely, S. pneumoniae is an uncommon cause of hemolytic-uremic syndrome (HUS). We report a 33 month-old girl who presented with pneumonia, and subsequently developed HUS. Her pulmonary infection was complicated by necrotizing pneumonia and acute respiratory distress syndrome. Cultures from blood and pleural fluid grew S. pneumoniae, serotype 19A. She was treated with antibiotics, dialysis and mechanical ventilatory support. She was discharged with normal renal function after 2 months of management. She remained healthy without renal complications at the 5 year follow-up visit.

• Clinical and Experimental Pediatrics
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• 제48권11호
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• pp.1193-1200
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• 2005

Purpose : Invasive bacterial infection is a major cause of morbidity and mortality in children. Previously, we reported etiology of invasive infections in healthy children in 1985-1995. This study was performed to update etiology of invasive bacterial infections in the previously healthy children. Methods : We reviewed medical records of 98 episodes of invasive bacterial infections in immunocompetent children at the Seoul National University Children's Hospital in 1996-2004. Results : The frequent pathogens identified over all age groups were Streptococcus pneumoniae (33%) and Staphylococcus aureus(33%). The proportion of Salmonella species and Haemophilus influenzae has been declined to 4% each from 23% and 14%, respectively, compared to previous study. S. agalactiae was the most common isolate in the infants ${\leq}3$ months. Among the infants and children aged 3 months to 2 years and children of 2-5 years, S. pneumoniae(57%, 52%, respectively, in each group) was the most common isolates followed by S. aureus(17% and 24%, respectively). S. aureus was the most common isolates(73%) in children >5 years. Primary bacteremia was the most common clinical diagnosis(27%). S. pneumoniae was responsible for 42% of primary bacteremia, 50% of meningitis, and 69% of bacteremic pneumonia and empyema. S. aureus accounted for 80% of bone and joint infections. The case fatality rate was 8.1% for all invasive infections. Conclusion : We reviewed frequency of bacterial agents of invasive infections in children. The data may be useful for pediatricians to select adequate empirical antibiotics in the management of invasive bacterial infections.

• Pediatric Infection and Vaccine
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• 제4권2호
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• pp.218-224
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• 1997

Purpose: The antimicrobial resistance of S. pneumoniae has encountered with increasing frequency from around the world. In our country, penicillin resistant strains of S. penumococci are rapidly increasing. It has been known that colonized pneumococci in upper respiratory tract cause sinisitis, otitis media, meningitis and pneumonia. We tried to reveal the colonization rate of pneumonocci in upper respiratory tract, their antimicrobial resistance and DNA fingerprinting pattern in normal children. Methods: We got specimens from 117 children of day-care center in Seoul through oropharyngeal swab. After incubation on BAP, optochin test and slide latex agglutination test were used for identification. Antimicobial susceptibility test to penicillin, vancomycin, erythromycin and TMP-SMZ was done with disk diffusion method. Penicillin MIC was gotten through the broth microdilution method. Genotyping of 45 pneumococci was done by rep-PCR using REP1R-Dt and REP2-Dt primer. Results: The carriage rate of pneumococci in the day-care center children was 38%(45/117). The resistance of penicillin, erhthromycin, TMP/SMZ, vancomycin by the disk diffusion method are 89%, 91%, 64% and 0%, respectively. 64% of the isolates showed multiple resistance. 7 types of DNA fingerprinting were gotten and 78% of isolates belonged to three types. Conclusion: We found that the antimicrobial resistance of children attending the day-care center in Seoul was much higher than expected. We assumed that this might be due to their easy and frequent exposure to antimicrobial agents and crowded day-care center environment.