• 한국환경보건학회지
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• 제47권2호
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• pp.182-191
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• 2021

Objective: This study was performed to detect indicator bacteria in drinking spring water samples in Gwangju City and to identify their genus using the VITEK-II system. Methods: The subjects were ten drinking spring water sites in Gwangju. Samples of spring water were taken every month from September 2019 to August 2020. We analyzed for the indicator bacteria Yersinia and microorganisms isolated from the spring water. Result: According to the research results on indicator bacteria, general bacteria in st1-st7 with sterilization facilities in the spring and summer were investigated in the range of 0-2 CFU/mL and 0-12 CFU/mL. In st9, where a sterilization facility was not installed, the most general bacteria were detected (160 CFU/mL). Total coliform and fecal coliform showed unsatisfied rates of 16.7 and 11.1% in spring and 14.7 and 11.8% in summer, respectively. The unsatisfied rates of total coliform for the designated and non-designated spring water facilities were 3.8 and 47.1%, respectively, and for the fecal coliform group they were 2.5 and 35.3%. The difference was confirmed according to the presence of a sterilization facility. Yersinia spp. was not detected in all drinking spring water. Forty-one strains in 25 species were isolated from ten sites. The results classified as major dominant species are Pseudomonas spp. 14.6%, Pantoea spp. 9.8%, Serratia spp. 9.8%, Acinetobacter spp. 9.8%, Citrobacter spp. 7.3%, Bordetella spp. 7.3%, Delftia spp. 4.9%, and Enterobacter spp. 4.9%. Conclusions: Based on the result that various species derived from fecal pollution and artificial pollutants were detected in the non-specified public spring water facilities that many people use, the facilities need institutional complements such as continuous management or complete shutdowns.

• 한국미생물·생명공학회지
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• 제49권3호
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• pp.391-402
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• 2021

Earthworms play an important role in soil fertilization, interacting continually with microorganisms. This study aims to demonstrate the existence of beneficial microorganisms living in the earthworm's immune system, the coelomic fluid. To achieve this goal, a molecular identification technique was performed, using cytochrome c oxidase I (COI) barcoding to identify abundant endogenic earthworms inhabiting the temperate zone of Rabat, Morocco. Then, 16S rDNA and ITS sequencing techniques were adopted for bacteria and fungi, respectively. Biochemical analysis, showed the ability of bacteria to produce characteristic enzymes and utilize substrates. Qualitative screening of plant growth-promoting traits, including nitrogen fixation, phosphate and potassium solubilization, and indole acetic acid (IAA) production, was also performed. The result of mitochondrial COI barcoding allowed the identification of the earthworm species Aporrectodea molleri. Phenotypic and genotypic studies of the sixteen isolated bacteria and the two isolated fungi showed that they belong to the Pseudomonas, Aeromonas, Bacillus, Buttiauxella, Enterobacter, Pantoea, and Raoultella, and the Penicillium genera, respectively. Most of the isolated bacteria in the coelomic fluid showed the ability to produce β-glucosidase, β-glucosaminidase, Glutamyl-β-naphthylamidase, and aminopeptidase enzymes, utilizing substrates like aliphatic thiol, sorbitol, and fatty acid ester. Furthermore, three bacteria were able to fix nitrogen, solubilize phosphate and potassium, and produce IAA. This initial study demonstrated that despite the immune property of earthworms' coelomic fluid, it harbors beneficial microorganisms. Thus, the presence of resistant microorganisms in the earthworm's immune system highlights a possible selection process at the coelomic fluid level.

• 한국식품과학회지
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• 제54권2호
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• pp.209-217
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• 2022

본 연구에서는 모유 유래 유산균 E. faecalis BMSE-HMP005의 다제내성 균주에 대한 항균효과 및 probiotics로써 잠재적인 가능성을 확인하였다. E. faecalis BMSE-HMP005는 다제내성 균주 20주(Enterococcus spp., Staphylococcus spp., Escherichia spp., Pseudomonas spp., Salmonella spp., Klebsiella spp., Enterobacter spp.)에서 모두 MBC가 확인되어 다제내성 균주에 대한 우수한 항균효과를 입증하였다. 또한 RP-HPLC를 이용하여 배양액 내 bacteriocin을 확인하였으며, 이에 대한 분획은 gram 양성 및 gram 음성균주에서 모두 항균력이 나타나, E. faecalis BMSE-HMP005가 생산하는 bacteriocin의 광범위한 항균 스펙트럼을 입증하였다. E. faecalis BMSE-HMP005는 발암 화합물을 유발하는 β-glucuronidase에 대한 활성과 용혈성은 나타나지 않아 안전한 것으로 판단된다. E. faecalis BMSE-HMP005는 vancomycin에 대해서는 내성을 보이나, kanamycin (>0.058), ampicillin (>0.002), erythromycin (>0.002)은 EFSA 기준의 허용범위보다 낮은 MIC가 확인되었다. 또한 인공위액(pH 2.0) 및 인공 담즙산(0.3% bile acid) 조건에서 각각 98.67%, 95.70%의 생존율을 보였다. 이와 같은 결과는 본 연구에서 분리한 모유 유래 유산균 E. faecalis BMSE-HMP005가 다제내성 균주에 대한 우수한 항균활성을 갖는 probiotics로써 잠재적인 가능성을 보여준다. 따라서 건강기능식품의 기준 및 규격에 제시된 바와 같이 Enterococcus spp.는 항생제 내성 및 독성 유전자가 없는 경우에 한하여 probiotics로 사용이 가능한 고시하고 있어 E. faecalis BMSE-HMP005의 안전성에 대한 추가적인 검증이 필요할 것으로 판단된다.

• The Plant Pathology Journal
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• 제40권1호
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• pp.48-58
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• 2024

The oldest and most extensively cultivated form of millet, known as pearl millet (Pennisetum glaucum (L.) R. Br. Syn. Pennisetum americanum (L.) Leeke), is raised over 312.00 lakh hectares in Asian and African countries. India is regarded as the significant hotspot for pearl millet diversity. In the Indian state of Haryana, where pearl millet is grown, a new and catastrophic bacterial disease known as stem rot of pearl millet spurred by the bacterium Klebsiella aerogenes (formerly Enterobacter) was first observed during fall 2018. The disease appears in form of small to long streaks on leaves, lesions on stem, and slimy rot appearance of stem. The associated bacterium showed close resemblance to Klebsiella aerogenes that was confirmed by a molecular evaluation based on 16S rDNA and gyrA gene nucleotide sequences. The isolates were also identified to be Klebsiella aerogenes based on biochemical assays, where Klebsiella isolates differed in D-trehalose and succinate alkalisation tests. During fall 2021-2023, the disease has spread all the pearl millet-growing districts of the state, extending up to 70% disease incidence in the affected fields. The disease is causing considering grain as well as fodder losses. The proposed scale, consisting of six levels (0-5), is developed where scores 0, 1, 2, 3, 4, and 5 have been categorized as highly resistant, resistant, moderately resistant, moderately susceptible, susceptible, and highly susceptible disease reaction, respectively. The disease cycle, survival of pathogen, and possible losses have also been studied to understand other features of the disease.

• 대한약리학회지
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• 제16권2호
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• pp.55-70
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• 1980

The pharmacological and microbiological studies of Cefoperazone (T-1551, Toyama Chemical Co., Japan) were conducted in vitro and in vivo. The studies included stability and physicochemical characteristics, antimicrobial activity, animal and human pharmacokinetics, animal pharmacodynamics and safety evaluation of Cefoperazone sodium for injection. 1) Stability and physicochemical characteristics. Sodium salt of cefoperazone for injection had a general appearance of white crystalline powder which contained 0.5% water, and of which melting point was $187.2^{\circ}C$. The pH's of 10% and 25% aqueous solutions were 5.03 ana 5.16 at $25^{\circ}C$. The preparations of cefoperazone did not contain any pyrogenic substances and did not liberate histamine in cats. The drug was highly compatible with common infusion solutions including 5% Dextrose solution and no significant potency decrease was observed in 5 hours after mixing. Powdered cefoperazone sodium contained in hermetically sealed and ligt-shielded container was highly stable at $4^circ}C{\sim}37^{\circ}C$ for 12 weeks. When stored at $4^{\circ}C$ the potency was retained almost completely for up to one year. 2) Antimicrobial activity against clinical isolates. Among the 230 clinical isolates included, Salmonella typhi was the most susceptible to cefoperazone, with 100% inhibition at MIC of ${\leq}0.5{\mu}g/ml$. Cefoperazone was also highly active against Streptococcus pyogenes(group A), Kletsiella pneumoniae, Staphylococcus aureus and Shigella flexneri, with 100% inhibition at $16{\mu}g/ml$ or less. More than 80% of Escherichia coli, Enterobacter aerogenes and Salmonella paratyphi was inhibited at ${\leq}16{\mu}/ml$, while Enterobacter cloaceae, Serratia marcescens and Pseudomonas aerogenosa were somewhat less sensitive to cefoperagone, with inhibitions of 60%, 55% and 35% respectively at the same MIC. 3) Animal pharmacokinetics Serum concentration, organ distritution and excretion of cefoperazone in rats were observed after single intramuscular injections at doses of 20 mg/kg and 50 mg/kg. The extent of protein binding to human plasma protein was also measured in vitro br equilibrium dialysis method. The mean Peak serum concentrations of $7.4{\mu}g/ml$ and $16.4{\mu}/ml$ were obtained at 30 min. after administration of cefoperazone at doses of 20 mg/kg and 50 mg/kg respectively. The tissue concentrations of cefoperazone measured at 30 and 60 min. were highest in kidney. And the concentrations of the drug in kidney, liver and small intestine were much higher than in blood. Urinary and fecal excretion over 24 hours after injetcion ranged form 12.5% to 15.0% in urine and from 19.6% to 25.0% in feces, indicating that the gastrointestinal system is more important than renal system for the excretion of cefoperazone. The extent of binding to human plasma protein measured by equilibrium dialysis was $76.3%{\sim}76.9%$, which was somewhat lower than the others utilizing centrifugal ultrafiltration method. 4) Animal pharmacodynamics Central nervous system : Effects of cefoperazone on the spontaneous movement and general behavioral patterns of rats, the pentobarbital sleeping time in mice and the body temperature in rabbits were observed. Single intraperitoneal injections at doses of $500{\sim}2,000mg/kg$ in rats did not affect the spontaneous movement ana the general behavioral patterns of the animal. Doses of $125{\sim}500mg/kg$ of cefoperazone injected intraperitonealy in mice neither increased nor decreased the pentobarbital-induced sleeping time. In rabbits the normal body temperature was maintained following the single intravenous injections of $125{\sim}2,000mg/kg$ dose. Respiratory and circulatory system: Respiration rate, blood pressure, heart rate and ECG of anesthetized rabbits were monitored for 3 hours following single intravenous injections of cefoperazone at doses of $125{\sim}2,000mg/kg$. The respiration rate decreased by $3{\sim}l7%$ at all the doses of cefoperazone administered. Blood pressure did not show any changes but slight decrease from 130/113 to 125/107 by the highest dose(2,000 mg/kg) injected in this experiment. The dosages of 1,000 and 2,000 mg/kg seemed to slightly decrease the heart rate, but it was not significantly different from the normal control. All the doses of cefoperazone injected were not associated with any abnormal changes in ECG findings throughout the monitering period. Autonomic nervous system and smooth muscle: Effects of cefoperazone on the automatic movement of rabbit isolated small intestine, large intestine, stomach and uterus were observed in vitro. The autonomic movement and tonus of intestinal smooth muscle increased at dose of $40{\mu}g/ml$ in small intestine and at 0.4 mg/ml in large intestine. However, in stomach and uterine smooth muscle the autonomic movement was slightly increased by the much higher doses of 5-10 mg/ml. Blood: In vitro osmotic fragility of rabbit RBC suspension was not affected by cefoperazone of $1{\sim}10mg/ml$. Doses of 7.5 and 10 mg/ml were associated with 11.8% and 15.3% prolongation of whole blood coagulation time. Liver and kidney function: When measured at 3 hours after single intravenous injections of cefoperaonze in rabbits, the values of serum GOT, GPT, Bilirubin, TTT, BUN and creatine were not significantly different from the normal control. 5) Safety evaluation Acute toxicity: The acute toxicity of cefoperazone was studied following intraperitoneal and intravenous injections to mice(A strain, 4 week old) and rats(Sprague-Dawler, 6 week old). The LD_(50)'s of intraperitonealy injected cefoperazone were 9.7g/kg in male mice, 9.6g/kg in female mice and over 15g/kg in both male and female rats. And when administered intravenously in rats, LD_(50)'s were 5.1g/kg in male and 5.0g/kg in female. Administrations of the high doses of the drug were associated with slight inhibition of spontaneous movement and convulsion. Atdominal transudate and intestinal hyperemia were observed in animals administered intraperitonealy. In rats receiving high doses of the drug intravenously rhinorrhea and pulmonary congestion and edema were also observed. Renal proximal tubular epithelial degeneration was found in animals dosing in high concentrations of cefoperazone. Subacute toxicity: Rats(Sprague-Dawley, 6 week old) dosing 0.5, 1.0 and 2.0 g/kg/day of cefoperazone intraperitonealy were observed for one month and sacrificed at 24 hours after the last dose. In animals with a high dose, slight inhibition of spontaneous movement was observed during the experimental period. Soft stool or diarrhea appeared at first or second week of the administration in rats receiving 2.0g/kg. Daily food consumption and weekly weight gain were similar to control during the administration. Urinalysis, blood chemistry and hematology after one month administration were not different from control either. Cecal enlargement, which is an expected effect of broad spectrum antibiotic altering the normal intestinal microbial flora, was observed. Intestinal or peritoneal congestion and peritonitis were found. These findings seemed to be attributed to the local irritation following prolonged intraperitoneal injections of hypertonic and acidic cefoperazone solution. Among the histopathologic findings renal proximal tubular epithelial degeneration was characteristic in rats receiving 1 and 2g/kg/day, which were 10 and 20 times higher than the maximal clinical dose (100 mg/kg) of the drug. 6) Human pharmacokinetics Serum concentrations and urinary excretion were determined following a single intravenous injection of 1g cefoperazone in eight healthy, male volunteers. Mean serum concentrations of 89.3, 61.3, 26.6, 12.3, 2.3, and $1.8{\mu}g/ml$ occured at 1,2,4,6,8 and 12 hours after injection respectively, and the biological half-life was 108 minutes. Urinary excretion over 24 hours after injection was up to 43.5% of administered dose.

• 한국수산과학회지
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• 제17권6호
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• pp.511-522
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• 1984

낙동강 하류 수계는 농수산업을 비롯하여 각 산업의 용수 뿐만아니라 400만 부산시민의 상수 급수원으로서도 대단히 중요하다. 본 수계의 효율적인 활용을 위하여 하구언을 축조하고 있다. 그래서 본 연구는 하구언 설치 이전과 이후의 수질 변화에 대한 기초재료를 얻기 위하여 1983년 8월부터 1984년 7월까지 계절마다 2회씩 모두 8회에 걸쳐 15개 지점에서 총 시료 120개를 취하여 분석하였다. 이들 시료에 대한 수온, pH, 염소 ion 및 염분도, 화학적 산소 요구량, 전기전도도, 영양염류, 위생지표세균, microflora에 대한 실험 결과를 요약하면 다음과 같다. 1. 수온의 연간변화는 $-1.5{\sim}29.0^{\circ}C$로 컸으며, 봄철의 수온은 $10{\sim}15^{\circ}C$로서 겨울철보다 약 $10^{\circ}C$ 상승하였고, 가을철의 수온은 전 지점에서 $20^{\circ}C$ 부근으로 매우 안정되었다. 여름철에는 기온의 상승에 따라 $21{\sim}29^{\circ}C$로 높았다. 2. pH의 연간변화는 $6.68{\sim}8.50$이었으며, 평상시의 pH는 상부수역에서 하구쪽으로 향할수록 점증하였으며, 하구수역에서는 8에 가까웠다. 그러나 강우량이 많았던 직후에는 오히려 상부수역이 높고 하구수역이 낮아지는 반대현상이었다. 3. 염소 ion 농도의 변화범위는 $7.4{\sim}l.020.5$ mg/l로 지점별 차가 심하였다. 또, 염분또는 $1.05{\sim}33.01\%$로 넓은 범위로 분포되었다. 상부에 녹산 수문이 있는 제3수로는 $25.76{\sim}31.58\%0$으로 육수나 하천수의 영향을 많이 받고 있는 제1, 2수로보다 높은염도를 나타내며 안정되어 있다. 4. 화학적 산소 요구량의 변화범위는 $1.45{\sim}14.94$ mg/l였으며, 상부, 중부수역과 각 수로의 기점은 5mg/l 이상이었고, 하구수역은 수산 2급 기준치인3 ppm을 모두 초과하였다. 5. 전기전도도의 변화범위는 $1.360{\times}10^2{\sim}5.650{\times}10^4{\mu}{\mho}/cm$였으며, 상부수역에서 보다 하구수역에서 월등히 높았으며 강우량이 많을시에는 전 수역에서 낮은 값으로 나타났다. 6. 영양염류의 년중 변화범위는 $NO_2-N\;:\;0.008{\sim}0.040$ mg/l, $NO_3-N\;:\;0.038{\sim}5.253$ mg/l, $NH_4-N\;:\;0.100{\sim}2.685$ mg/l, $PO_4-P\;:\;0.003{\sim}0.084$ mg/l, $SiO_2-Si\;:\;0.154{\sim}6.123$mg/l였으며, 각종 염류는 일반적으로 상부, 중부수역에서 높은 농도였으나, 강우량에 육수나 강수에 의해 운반되어 하구수역에서 농도가 높아진다. 특히 하구수역에서 질소, 인화합물이 20년전에 비하여 $2{\sim}3$배 증가되고 있어 이차적인 환역오염이 우려 된다. 7. 대장균군 최확수의 분포범위는 $7.3{\sim}460,000/100ml$였으며, 금곡에서 을숙도 구간인 중부수역에서의 기하평균치는 $3,476{\sim}34,700/100ml$으로 극심한 오염도를 나타내었다. 이 수질의 여파와 장림천 괴정천에서 유입되는 오수로 제1수로의 수질은 $1.100{\sim}460,000/100ml$로 제 2수로 보다 5배나 심하게 오염되어 있었다. 분편계대장균 최확수의 분포범위는 $3.6{\sim}460,000/100ml$였으며, 대장균군에서와 같은 양상이었다. 장구균 최확수는 $0{\sim}46,000/100ml$의 분포범위로 분편계대장균과 같은 양상이었다. 8. 대장균군으로 분리 동정된 총 452균주중에서 Escherchia coli group은 127 균주로 $28\%$, Citrobacter freundii group은 82 균주로 $18\%$, Enterobacter aerogenes group이 141균주, $31\%$로 제일 많았으며, 분류되지 않은것이 $22\%$ 정도였다. 9. 생균수의 연간 변화폭은 $<30{\sim}1.2{\times}10^5/ml$였으며, 각 수역별로 위생지표세균이 변화하였던 것과 같은 양상이었다. 10. 본 수계에서 분리 동정된 세균 총 659 균주중에서 Pseudomonas 속이 279 균주($42\%$)로서 제일 많았으며, Flavebacterium cytophaga 속이 131균주($20\%$), Moraxella속이 72균주($12\%$) 순이었으며, Bacillus 속이 $0.3\%$으로 제일 낮은 빈도를 나타내었다.

• Journal of Animal Science and Technology
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• 제49권5호
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• pp.667-676
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• 2007

본 연구는 톱밥주원료의 병재배 버섯폐배지의 퇴적발효 간 섬유소분해성 미생물 첨가가 발효물의 발효 성상, 균수 및 효소 활력에 미치는 영향을 평가하고, 미생물 처리한 버섯폐배지 급여시 면양의 영양소 이용성에 미치는 효과를 구명하고자 실시하였다. 면양 대사시험의 경우, 면양 6두를 공시하여 배합사료, 볏짚 그리고 버섯폐배지를 각각 70:15:15(건물기준)의 비율로 급여하였다. 처리구의 버섯폐배지는 퇴적발효 시 4종의 섬유소 분해균(201-3, 201-7, 206-3, 3)을 접종하였다. 1.2 M/T 규모의 버섯폐배지의 퇴적발효 온도는 발효 7일 이내에 50 ℃ 내외에 도달하였다. 고온의 발효열에 의해 발효 전과 비교해서 발효 후에는 대조구와 균처리구 모두 총균수가 현저히 감소하였고(P<0.05), 처리에 따른 차이는 없었다(P>0.05). 섬유소 분해효소의 활력에 있어서, CMCase와 xylanase의 활력은 퇴적발효 처리에 의해 공히 현저히 감소하였다(P<0.05). 발효 후에는 대조구와 비교해서 미생물 처리구에서 CMCase 활력은 2.5배 정도, xylanase 활력은 4배 정도 더 높았다(P<0.05). 리그닌 분해 효소인 laccase와 MnP의 활력은 미생물 처리에 따른 차이는 없었다. 면양대사시험 결과, 버섯폐배지를 볏짚 급여량의 50%(총사료의 15%)와 대체하였을 때(건물기준) 미생물 처리한 폐배지 발효물 급여 시에는 무처리 폐배지 발효물 급여시와 비교하여 면양체내에서의 ash(P=0.051), NFE(P=0.071), hemicellulose(P=0.087) 및 NDF(P=0.096)의 전장 소화율은 증가하는 경향이었으며, 체내 질소 균형은 차이가 없었다(P>0.05). 따라서 이러한 연구 결과는 톱밥주원료 버섯폐배지의 발효사료화 시 섬유소분해성 미생물 처리는 반추동물에 의한 폐배지 영양소의 체내 이용성을 향상시킬 수 있음을 시사해 주고 있다.

• Clinical and Experimental Pediatrics
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• 제45권7호
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• pp.847-854
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• 2002

목 적: 신생아 집중치료실에 장기간 입원 중인 환아는 입원중 전신성 감염을 일으킬 위험이 있다. 이미 항생제를 투여 받고 있는 환아에서 전신 감염 증상이 발현하면, 전신성 칸디다증은 장기간의 amphotericin B의 투여가 필요하며 세균 감염증은 감수성 있는 항생제로의 교체를 필요로 한다. 본 연구에서는 미숙아인 저출생 체중아를 대상으로 전신성 칸디다증의 임상증상과 증상 발현시의 검사 소견을 전신성 세균 감염증과 비교함으로써 이들 소견의 조기 감별 진단 상의의를 조사하였다. 방 법 : 1997년 1월부터 2001년 6월까지 경북대학교병원 신생아 집중치료실에 입원했던 미숙아 중 저출생 체중아 중에서 배양검사로 확인된 전신성 칸디다증 20례와 전신성 세균 감염증 23례를 대상으로 하여 이들의 의무 기록을 후향적으로 조사하였다. 결 과: 전신성 칸디다증 환아(이하 칸디다군)의 출생시 체중은 $1,290{\pm}290g$으로 전신성 세균 감염증 환아(이하 세균군)의 $1,530{\pm}430g$보다 유의하게 작았으며, 총 정맥 영양, 항생제 투여, 중심 카테테르, 기관 삽관, $H_2$ 차단제 사용의 빈도가 더 높았다. 임상 양상에 있어서는 서맥 동반 무호흡 및 호흡 곤란이 두 군의 주된 발현시 증상으로, 발현 빈도는 칸디다군(90%)에서 세균군(61%)에 비해 높았다. 증상 발현시 시행한 검사 소견에서 혈소판 감소증과 백혈구 감소증이 동반된 경우가 칸디다군 7례(35%), 세균군 2례(9%)로 두 군 사이에 유의한 차이를 보였다(P=0.03). 균은 대부분 혈액에서 배양되었으며(칸디다군 19례, 세균군 19례), 그 외에 요, 중심 카테테르, 뇌척수액 등에서 배양되었다. 감염균은 칸디다군은 Candida albicans가 15례, 세균군은 Klebsiella pneumoniae와 Enterobacter cloacae가 각각 5례로 가장 빈번하였다. 결 론 : 신생아 집중치료실에 장기 입원 중 전신 감염증 증상을 보이는 환아에서 호흡기 증상과 함께 검사상 혈소판 감소 단독 또는 혈소판 감소증과 백혈구 감소증이 동반된 경우에는 전신성 칸디다 감염증 가능성이 높을 것으로 사료된다.

• 대한미생물학회지
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• 제15권1호
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• pp.19-32
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• 1980

Besides the benefits of antimicrobial agents in the control of various infectious diseases, widespread and prolonged use of particular antimicrobial agents has brought about the increase of drug-resistant strains in a community and the profound changes in the pattern of infectious diseases. In Korea, there are some remote villages where no clinics and drug stores are available and the residents in those areas are assumed to have fewer chances to contact with antimicrobial agents. In the present study, the differences in susceptibilities to 14 antimicrobial agents between the isolates from rural areas(R) and Seoul National University Hospital(SNUH, H) were studied. The isolates and their numbers were Staphylococcus aureus, R;55, H;68), Enterococci(R;28, H;30), Escherichia coli(R;40, H;40), Enterobacter aerogenes(R;25, H;21) and Klebsiella pneunoniae(R;58, H;67). Minimal inhibitory concentrations(MIC's) of penicillin, ampicillin, carbenicillin, cephalexin, tetracycline, oxytetracyline, doxycycline, minocycline, gentamicin, kanamycin, streptomycin, erythromycin, troleandomycin and co-trimoxazole were determined by agar dilution method. I. Comparison of MIC's and resistant strain proportions between isolates from SNUH and rural areas. MIC's and/or resistant strain proportions of the isolates from SNUH were significantly higher than those of the isolates from rural areas in the cases of 1. S. aureus to doxycycline, streptomycin and kanamycin. 2. E. coli to penicillin, ampicillin, carbenicillin, tetracycline, oxytetracycline, doxycycline, minocycline, streptomycin, kanamycin, erythromycin and co-trimoxazole. 3. E. aerogences to carbenicillin, tetracycline, oxytetracycline, doxycycline, minocycline, streptomycin, kanamycin, genaamicin and co-trimoxazole. 4. K pneunoniae to penicillin, ampicillin, tetracycline, oxytetracycline, doxycycline, monocycline, streptomycin, kanamycine, gentamicin and co-trimoxazole. However, the mean MIC and resistant strain proportion of S. aureus to tetracycline were higher in isolates from rural areas than in those from SNUH and Enterococci showed no differences in susceptibilities to the antimicrobial agents between isolates from rural areas and from SNUH. Therefore, in general, differenes in susceptibility to these antimicrobial agents between the isolates from rural areas and SNUH were remarkably greater and broader in gram negative enteric bacteria. II. Multiple drug resistance pattern. Patterns and incidences of multiple drug resistance were studied with penicillin, ampicillin, tetracycline, cephalexin, gentamicin, streptomcin, kanamycin and co-trimoxazole in Enterococci, E. coli, E. aeroges and K. pneumoniae. There appeared significant differences in the incidence of multiply drug-resistant strains and multiple drug resistance patterns between the isolates from SNUH and rural areas in Enterococci, E. coli, E. aerogenes and K. pneumoniae. However, there was no difference in the incidence of multiply drug-resistant strains between isolates of S. aureus from SNUH and rural areas but the pattern of multiple resistance of the SNUH strains of S. aureus was diverse, while that of the rural strains was predominantly confined to penicillin-tetracycline combination. The incidence of multigly drug-resistant strains and diversity of their patterns were the highest in E. coli strains isolated from SNUH and there were no multiply drug resistant strrains in Enterococci and K. pneumoniae strains isolated from rural areas. The number of drug-resistance determinants was also different between the isolates from rural areas and SNUH. Most of the multiply drug-resistant strains of E. coli, E. aerogenes and K. pneumoniae isolated from SNUH were resistant to more than 3 kinds of antimicrobial agents, most frequently to ampicillin, tetracycline and streptomycin, while multiply drug-resistant strains from rural areas were resistant to 2 kinds of antimicrobial agents among ampicillin, tetracycline and streptomycin. With drug-resistant E. coli strains, resistance to tetracycline which was used most widely since 1951 was most frequently involved as a part of mutliple drug-resistance, followed by resistance to ampicillin and streptomycin. This strongly suggests that emergence of drug-restant strains in a community is directly dependent on the selective pressure exerted by the antimicrobial agent used. III. Cross resistance. Cross resistance of bacteria was studied among tetracycline penicillin, aminoglycoside and macrolide derivatives by analyzing correlation coefficients of sucseptibilities using the least square method. In this study, there were high correlations among the susceptibilities to related derivatives. It appears that the relatively low correlations in susceptibilities present in some cases are due to intrinsic resistance of E. aerogenes to penicillin, Enterococci to aminoglycoside and E. coli E. aerogenes and K. pneumoniae to macrolide derivatives.

• Pediatric Infection and Vaccine
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• 제4권1호
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• pp.79-89
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• 1997

목 적 : 신생아 세균성 뇌막염은 임상 증상이 비특이적이며 여러가지 신경학적 후유증을 남길 수 있는 질환으로 본 저자들은 원인균 특히 그람 양성균과 음성균에 의한 뇌막염을 비 교 분석하여 치료 및 예후의 개선을 도모하고자 본 연구를 시행하였다. 방 법 : 1991년 1월부터 1996년 6월까지 중앙 길병원 신생아 중환자실과 소아과 병동에서 뇌척수액 검사상 균이 배양되었거나 latex agglutination test상 균이 밝혀진 24례를 대상으로 후향적으로 분석하였다. 결 과 : 1) 환아의 분포는 남아 17명, 여아 7명이었고, 그람 양성균에 의한 뇌막염 환아의 평균 출생 체중과 재태 기간은 $2.91{\pm}0.79kg$, $38.4{\pm}2.74$주, 그람 음성균군에서는 $3.30{\pm}0.90kg$, $37.7{\pm}3.33$ 주로 두 군간에 유의한 차이는 보이지 않았다. 2) 선행 요인으로는 미숙아, 태변 착색, 조기 양막 파수, 산모 당뇨병, 임신성 고혈압 등이 있었으며, 임상 증상 및 증후로는 발열, 경련, 수유량 감소, 대천문 팽대 등이 있었고, 증상 발현 시기는 조기 발현형이 11례(그람 양성균 4례, 그람 음성균 7례), 지연 발현형이 13례 (그람 양성균 7례, 그람 음성균 6례)였다. 3) 원인균은 그람 양성균이 11례로 coagulase-negative staphylococci와 group B streptococci가 각 3례, Staphyolococcus aureus와 Streptococcus viridans가 각 2례, enterococci가 1례가 있었으며, 그람 음성균은 13례로 Escherichia coli가 7례, Klebsiella pneumoniae가 3례 Pseudomonas aeruginosa, Acinetobactor, Emterobacter가 각 1례씩 있었다. 4) 뇌척수액 검사상 백혈구 수치는 그람 음성균군에서 통계적으로 유의하게 높았으나 단백 수치와 당 수치는 두 군간에 통계적으로 유의한 차이를 보이지 않았다. 5) 뇌초음파 검사상 그람 양성균군에서는 7례(63.6%)에서, 그람 음성균군에서는 10례 (76.9%)에서 비정상 소견을 보였으나 두 군간에 뇌초음파 검사상 비정상 소견의 빈도에 있어서는 통계적으로 유의한 차이를 보이지 않았다. 6) 항생제 감수성 검사에서 그람 양성균군에서는 penicillin계통, 1세대 cephalosporin, vancomycin에, 그람 음성균군에서는 amikacin과 3세대 cephalosporin에 대해 비교적 높은 감수성을 보였다. 7) 사망율(병원내 사망이나 hopeless discharge)은 20.8%(5례)였으며, 예후는 그람 양성균 군과 그람 음성균군에서 통계적으로 유의한 차이를 보이지 않았다. 결 론 : 신생아 세균성 뇌막염은 그람 양성균과 그람 음성균 간의 빈도와 예후의 차이는 보이지 않았고 예후가 불량하므로 세균성 뇌막염이 의심되는 환아에서는 적극적인 치료가 필요하리라 사료된다.