• Journal of Microbiology and Biotechnology
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• 제25권2호
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• pp.288-295
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• 2015

Salmonella enterica serovar Enteritidis is the predominant agent causing salmonellosis in chickens and other domestic animals. In an attempt to identify antigenic S. Enteritidis outer membrane proteins (OMPs) that may be useful for subunit vaccine development, we established a proteomic map and database of antigenic S. Enteritidis OMPs. In total, 351 and 301 spots respectively from S. Enteritidis strain 270 and strain 350 were detected by two-dimensional gel electrophoresis. Fifty-one antigen-reactive spots were detected by antisera on two-dimensional immunoblots and identified as 12 specific proteins by matrix-assisted laser desorption ionization time-of-flight mass spectrometry. OmpA and DNA starvation/stationary phase protection protein (Dps) were the most abundant proteins among the identified OMPs, comprising 22 and 12 protein species, respectively. Interestingly, we found that the Dps of S. Enteritidis is also antigenic. OmpW was also verified to have high antigenicity. These results show that OmpA, Dps, and possibly OmpW are antigenic proteins. This study provides new insights into our understanding of the immunogenic characteristics of S. Enteritidis OMPs.

• 한국축산식품학회지
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• 제33권2호
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• pp.239-243
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• 2013

Salmonella Enteritidis is responsible for causing foodborne diseases upon consumption of egg products. While cases of S. Enteritidis isolation from eggs have been reported in other countries, no such cases have previously been reported in Korea. In this study, we report the first isolation and identification of S. Enteritidis from domestically distributed eggs in Korea. Eggs were collected from eight countrywide grocery stores during different seasons between 2011 and 2012. Egg contents and washing solution of egg shells were incubated in buffered peptone water, and the enriched broth was further enriched in tetrathionate broth and Rappaport-Vassiliadis. The secondary enriched broth was streaked on xylose lysine desoxycholate agar. The suspected colonies were confirmed to S. Enteritidis by a biochemical test, serotyping, and PCR test. Genetic relatedness among the isolates was analyzed using Diversilab Salmonella kit. Three strains of S. Enteritidis were isolated from egg contents and egg shells collected from grocery stores of the Eumseong-city in the fall of 2011. All three stains showed resistance to chloramphenicol, streptomycin, nalidixic acid, and ampicillin by the disk diffusion method. In addition, the isolates showed more than 99% DNA homology, indicating that they were presumably identical strains. Therefore, there is a requirement to monitor and control against S. Enteritidis from eggs in Korea.

• 한국환경보건학회지
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• 제33권5호
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• pp.403-407
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• 2007

The inhibitory effect of the food processing agent on growth of Escherichia coli O157:H7, Salmonella Enteritidis, and Listeria monocytogenes was performed with organic acid, and combination of citric acid, acetic acid, propionic acid and vanillic acid. The minimun inhibitory concentration(MIC) of propionic acid was 5,000 ppm in E. coli O157:H7, 2,500 ppm in Salmonella Enteritidis and Listeria monocytogenes. MIC of citric acid was 10,000 ppm in E. coli O157:H7 and Salmonella Enteritidis, 2,500 ppm in Listeria monocytogenes. MIC of acetic acid was 2,500ppm, while in vanillic acid was 5,000 ppm in Escherichia coli O157:H7, Salmonella Enteritidis, and Listeria monocytogenes. MIC of combined organc acid in E. coli O157:H7 were 2,500ppm in PC, 1,250 ppm in PA, PV, CA, CV and AV. MIC of combined organc acid in Salmonella Enteritidis were 2,500 ppm in PC, PA, PV, CA, and CV, 1,250 ppm in AV. MIC of combined organc acid in Listeria monocytogenes were 1,250 ppm in all treatment group. MIC of combined treatment of three organc acid in E. coli O157:H7, S. Enteritidis and L. monocytogenes were 1,250 ppm in PCA, PCV, PAV and CAV. The inhibitory effect of organc acid in E. coli O157:H7, S. Enteritidis and L. monocytogenes could be confirmed from the result of this experiment. Therefore, it was expected that the food process would increase or maintain by using organic acid.

• 대한의생명과학회지
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• 제11권1호
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• pp.9-13
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• 2005

A total of 22 Salmonella enterica serotype Enteritidis (S. Enteritidis) isolates from human and chicken sources were analyzed by pulsed field gel electrophoresis (PFGE) using XbaI restriction enzyme to assess the genetic relationships between strains from different sources. PFGE permitted the resolution of XbaI restriction fragments of the 22 S. Enteritidis into 6 distinct PFGE types (PFT), designated PFT1 to PFT6, and 2 subtypes within PFT2, and allowed to detect between 9 and 10 bands with fragments sizes in the range of $25\~635\;kb$. Four of twelve isolates from human showed an identical PFGE patterns with 2 isolates from chickens. Also, another one isolate from human showed an identical PFGE patterns with other 5 isolates from chickens. Only one isolate from chicken, however, showed a different pattern compared to other PFTs. These results suggested that sporadic human food-poisoning cases infections caused by S. Enteritidis in this study were due to the consumption of contaminated chicken meats and that a clonally highly similar strains exist and spread between human and chicken sources.

• 환경위생공학
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• 제19권4호
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• pp.69-75
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• 2004

The inhibitory effect of the food processing agent on growth of Escherichia coli O157:H7, Salmonella Enteritidis, and Listeria monocytogenes was performed with hydrogen peroxide and lactic acid, and combination of hydrogen peroxide and lactic acid. The minimun inhibitory concentration (MIC) of hydrogen peroxide in E coli O157:H7 was 100 ppm at pH 5.0, 6.0, 6.5 and 7.0, while in Listeria monocytogenes 25 ppm at PH 5.5, 6.0 and 50 ppm at PH 6.5, 75ppm at pH 7.0. MIC of lactic acid in E coli O157:H7 was 2500 ppm at pH 5.0, 6.0, 6.5 and 7.0. MIC of lactic acid in S. Enteritidis was 1250 ppm at pH 5.0, 2500 ppm at pH 5.5, 6.0, 5.5 and 7.0, while in L monocytogenes 625 ppm at pH 5.5 and 125 ppm at pH 6.0, 6.5 and 7.0. MIC of combined hydrogen Peroxide and lactic acid in E. coli O157:H7, S. Enteritidis, and L. monocytogenes was 75 ppm of hydrogen peroxide with 2500 ppm of lactic acid at pH 6.5. The correlations between MICs of hydrogen peroxide and lactic acid in E. coli O157:H7, S. Enteritidis and L. monocytogene were obtained through the coefficient of $determination(R^2)$. $R^2$ value were 0.9994, 0.9935 and 0.9283, respectively. The inhibitory effect of hydrogen peroxide and lactic acid in E. coli O157:H7, S. Enteritidis and L. monocytogenes could be confirmed from the result of this experiment. Therefore, it was expected that the food process would increase or maintain by using lactic acid together with hydrogen peroxide.

• 한국가금학회지
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• 제25권4호
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• pp.161-167
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• 1998

가금 및 가축의 살모넬라중을 일으키는 에서 편모항원을 순수분리하고 이를 면역원으로 산란계에 면역하여 난황 중에 형성된 항체와 혈청간에 면역 반응을 조사하고 생산된 에 대한 특이난황 항체의 특이성 검사와 항체회수율 검사를 실시한 결과S. enteritidis는 다음과 같다. 1. S. enteritidis에서 순수 분리한 flagella protein 의 분자량은 54.6 kDa으로 나타났다. 2. 산란계의 혈청중 항체가 형성은 면역 후 2주경부터 급격히 증가하기 시작하여 6주경에 최고의 항체가 수준에 도달하였다. 반면에 난황중 항체가는 면역 후 4주경부터 급격히 증가하기 시작하여 6주경에 혈청항체가 수준과 동일하게 도달되며, 10주 이후에는 혈청항체가 수준보다 높게 형성되어 일정한 수준을 유지하였다. 3. S. enteritidis의 flagella protein을 면역원으로 산란계에 면역하여 생산된 난황항체는 주로 S. enteritidis 균주에서만 특이적으로 반응하며 E. coli (Kl2:K99, K88+, 987P) 균체에서는 반응이 전혀 없는 것으로 나타났다. 4. 한개의 난으로부터 분리한 IgY의 함량은 106 mg이었으며 회수율은 88.3％였다.

• 한국동물위생학회지
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• 제41권3호
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• pp.149-155
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• 2018

Salmonella Enteritidis (S. Enteritidis) are found in animals, humans, and environment. In addition, S. Enteritidis draws attention to the public health concerns due to carriage of antibiotic resistance traits. For these reasons, the prevalence and antibiotic resistance patterns of S. Enteritidis are significant issues with regard to public health. To address this issues, a total of 24 strains of S. Enteritidis from 164 samples collected from several slaughterhouses in Gyeong-Nam province in order for antibiotic resistance profiles. Subsequently, we characterized the genotyping by random amplification polymorphic DNA (RAPD)-PCR. As a result, very high level of resistance to protein synthesis inhibition antibiotics and most isolates were susceptible to others. Six random primers were used for RAPD-PCR to reveal genotypes of S. Enteritidis isolates. One of the primer, P1245, generated 147 distinct RAPD-PCR fragments ranging from 400~3000 bp. The number of RAPD-PCR products ranged from 4 to 8 for this primer. The RAPD-PCR fragments could be placed these strains into 3 subgroups and 2 classes by UPGMA cluster analysis. Interestingly, several S. Enteritidis that isolated from different slaughterhouses showed same genotype. These results showed only limited genetic variation among the isolates, those were grouped into a few different patterns of antibiotic resistance.

• 한국환경보건학회지
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• 제39권3호
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• pp.239-246
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• 2013

Objectives: Antimicrobial resistance and multidrug resistance patterns have been studied with a total of 189 samples of Salmonella Enteritidis and Salmonella Typhimurium isolated from diarrhea patients in Incheon from 2008 to 2012. Methods: Antimicrobial resistance tests were determined by Disc Diffusion method. Results: The serological distribution of Salmonella spp. showed 108 strains (30.1%) of S. Enteritidis, 81 strains (22.6%) of S. Typhimirium, eight strains (8.0%) of S. Typhi, 11 strains ( 3.1% ) of S. Paratyphi, and the 151 other strains (42.1%). The separation rate of Salmonella spp. by year showed 14.5% (52 strains) in 2008, 13.6% (49 strains) in 2009, 22.8% (82 strains) in 2010, 25.3% (91 strains) in 2011, and 23.7% (85 strains) in 2012. Additionally, the separation rate of S. Enteritidis and S. Typhimirium in 2010 was the highest. The Salmonella spp. isolated from diarrhea patients showed significant differences according to age (p<0.05), gender (p<0.01) and medical institution (p<0.05). The highest resistance was found to the following antimicrobial agents: imipenem 77 strains, ampicillin 47 strains, ciprofloxacin 34 strains, nalidixic acid 29 strains for S. Enteritidis, and ampicillin 45 strains, nalidixic acid 45 strains for S. Typhimurium. Separated S. Enteritidis and S. Typhimurium resistance to the antibiotics by the year showed significant differences (p<0.05). The patterns of multidrug resistance rates were 43.1% (47 strains) for one drug, 8.3% (9 strains) for two drugs, 11.0% (12 strains) for three drugs, 15.62% (17 strains) for four drugs, and 13.7% (15 strains) for five or more drugs for S. Enteritidis. For S. Tyhpimurium, the rates were 15.0% (12 strains) for one drug, 10.0% (8 strains) for two drugs, 6.3% (five strains) for three drugs, 18.7% (15 strains) for four drugs, and 23.8% (19 strains) for five or more drugs. Conclusion: The antibiotic resistance issue is directly related to people's lives. Thus, the usage of antibiotics should be reduced in order to manage antibiotic resistance.

• Journal of Animal Science and Technology
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• 제45권3호
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• pp.473-482
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• 2003

Lactobacillus spp. 급여에 의하여 Salmonella enteritidis 감염에 의한 치사율의 저하 성향, 시험관내 억제활성, 장액 내의 총 IgA 농도변화와 Lactobacillus casei.의 16S-23S rRNA intergenic spacer region의 sequence를 측정 비교한 결과는 다음과 같다. Lactobacillus spp. 5균주는 시험관내 Salmo- nella enteritidis 억제활성 측정 결과 모든 시험균주가 억제활성을 나타내었고 그 억제활성의 차이가 통계적인 유의성을 보였으며, 억제활성의 차이는 L. helveticus CU 631 > L. rhamnosus GG ATCC 53103 > L. johnsonii C-4 > L. acidophilus ATCC 4356 > L. casei YIT 9018 인 것으로 나타났다. Lactobacillus spp. 급여에 의하여 Salmonella enteritidis challenge에 의한 치사율 저하효과는 Lb. helveticus CU 631은 대조구의 생존률 62%에 대하여 100%로서 가장 높은 치사율 저하효과를 나타내었고, L casei YIT 9018, L johnsonii C-4의 생존률이 70%와 50%를 나타내었다. Lactobacillus spp.의 16S-23S rRNA intergenic spacer region의 sequence를 측정하고 gene bank에 등록된 균주의 sequence와 비교한 결과 homology의 차이를 나타내었다.

• 생명과학회지
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• 제33권1호
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• pp.56-63
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• 2023

2021년 국내에서 가장 많은 수의 식중독 환자가 Salmonella로 인해 발생하였고, 전 세계적으로도 꾸준한 발생이 보고되고 있다. 본 연구에서는 2021년 9월 중 경상남도에서 발생한 2건의 Salmonella 원인의 식중독에 대한 사례 보고 및 분리된 Salmonella 균주의 분자역학적 특성을 분석하였다. 학교 급식 사례는 동일 섭취원 588명 중 29명(4.9%)이 설사 및 복통 증상을 보였고 36명(환자 29, 조리 종사자 7)에 대한 검사 결과, Salmonella Enteritidis가 환자 17명(47.2%)에서 검출되어 주원인으로 판단되었다. 식품 및 환경 검체 35건에서는 S. Enteritidis가 검출되지 않았다. 다음으로, 회사 내 발생 사례는 동일 섭취원 2,900명 중 87명 (3.0%)이 설사, 복통, 발열 증상을 보여 50명(환자 40, 조리 종사자 10)을 검사를 했고, 그 결과 환자 28명 (56.0%)에서 S. Enteritidis가 검출되었다. 그중 4명은 Vibrio cholerae (NAG)와 S. Enteritidis가 중복 검출되었고 1명은 V. cholerae (NAG)만 검출되었다. 이는 S. Enteritidis와 복합적으로 작용했을 가능성을 배제할 수는 없지만 주원인으로는 S. Enteritidis로 판단되었다. 식품 및 환경 검체 125건 중 보존식에서는 S. Enteritidis가 불검출이었으나, 회사에서 단체로 배달 주문하여 섭취한 토스트에서 S. Enteritidis가 검출되었다. PFGE 유전학적 상동성을 분석한 결과, 환자와 식품에서 분리된 S. Enteritidis 균주가 동일한 유형으로 확인되었다. 이는 앞서 발생한 경남지역 학교 사례와 타 지역 사례의 환자 분리 균주와도 동일한 유형으로 확인되어 문제성이 더욱 제고되고 있다. 이와 같이 S. Enteritidis 원인 식중독의 분자역학적 특성 분석을 통해 역학적 관리 및 식중독 예방에 필요한 자료를 제공하고자 한다.