• 제목/요약/키워드: Campylobacter species

검색결과 33건 처리시간 0.027초

Isolation and Identification of Pathogenic Microorganisms from Soybean Sprouts

  • Kim, Hye-Jung;Koo, Kyoung-Mo;Kim, Gi-Nahm;Lee, Dong-Sun;Paik, Hyun-Dong
    • Preventive Nutrition and Food Science
    • /
    • 제7권3호
    • /
    • pp.305-309
    • /
    • 2002
  • Raw soybean sprouts were tested for contamination with the following bacteria which have potential for pathogenesis or food spoilage : Salmonella spp., Escherichia coli O157:H7, Yersinia enterocolitica, Vibrio parahae-molyticus, Aeromonas hydrophila, Plesidomonas shigeloides, Pseudomonas aeruginosa, Staphylococcus aureus, Lis-teria monocytogenes, Bacillus cereus, Clostridium perfringens, Campylobacter jejuni, Erwinia spp., and Fusarium spp. Three of the above strains were isolated from the sprouts, and identified by morphological and biochemical methods including an API kit and ATB automated identification system. The isolate cultured in Cereus selective agar, a selective medium, was a Gram-positive, rod shaped, anaerobic spore former. The biochemical and culture tests revealed the following characteristics: catalase-positive, no growth on Simmon's citrate, NO₂ production and requirement of arginine for growth; the ATB automated identification system gave 99.8 % agreement for the identification of Bacillus cereus to the species level. The isolate cultured in Macconkey agar selective medium was Gram-negative, rod shaped and a gas former; the ATB-system gave 99.9% agreement for the identification of Aeromonas hydrophila to the species level. The isolate found in Pseudomonas isolation agar was Gram-negative, rod shaped, cytochrome oxidase-positive, a reducer of nitrates to nitrogen, and pyocyanin producer; the ATB-system gave 99.9 % agreement for the identification of Pseudomonas aeruginosa to the species level. These results indicate that the three bacteria species present in the soybean sprouts were Bacillus cereus, Aero-monas hydrophila, and Pseudomonas aeruginosa. Salmonella spp., Escherichia coli O157:H7, and Yersinia enter-ocolitica, which are associated with serious disease in humans, were not isolated from soybean sprouts examined in this study.

Detection of Campylobacter jejuni in food and poultry visors using immunomagnetic separation and microtitre hybridization

  • Simard, Ronald-E.
    • 한국어업기술학회:학술대회논문집
    • /
    • 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
    • /
    • pp.71-73
    • /
    • 2000
  • Campylobacter jejuni is most frequently identified cause of cause of acute diarrhoeal infections in developeed countries, exceeding rates of illness caused by both salmonella and shigilla(Skirrow, 1990 ; Lior 1994). Previous studies on campylobacter jejuni contamination of commercial broiler carcasses in u.s.(Stern, 1992). Most cases of the disease result from indirect transmission of Campylobactor from animals via milk, water and meat. In addition to Campylobactor jejuni. the closely relates species Campylobactor coli and Campylobactor lari have also been implicated as agents of gastroenteritis in humans. Campylobactor coli represented only approximately 3% of the Campylobactor isolates from patients with Campylobactor enteritis(Griffiths and Park, 1990) whereas Campylobactor coli is mainly isolated from pork(Lmmerding et al., 1988). Campylobactor jejuni has also been isolated from cases of bacteremia, appendicitis and, recently, has been associated with Guillai-Barre syndrome(Allos and Blaser, 1994; von Wulffen et al., 1994; Phillips, 1995). Studies in volunteers indicated that the infectious dose for Campylobactor jejuni is low(about 500 organisms)(Robinson, 1981). The methods traditionally used to detect Campylobactor ssp. in food require at least two days of incubation in an enrichment broth followed by plating and two days of incubation on complex culture media containing many antibiotics(Goossens and Butzler, 1992). Finnaly, several biochemical tests must be done to confirm the indentification at the species level. Therfore, sensitive and specific methods for the detection of small numbers of Campylobactor cells in food are needed. Polymerase chain reaction(PCR) assays targeting specific DNA sequences have been developed for the detection of Campylobactor(Giesendorf and Quint, 1995; Hemandex et al., 1995; Winter and Slavidk, 1995). In most cases, a short enrichment step is needed to enhance the sensitivity of the assay prior to detection by PCR as the number of bacteria in the food products is low in comparison with those found in dinical samples, and because the complex composition of food matrices can hinder the PCR and lower its sensitivity. However, these PCR systems are technically demanding to carry out and cumbersome when processing a large number of samples simutaneously. In this paper, an immunomagnetic method to concentrate Campylobactor cells present in food or clinical samples after an enrichment step is described. To detect specifically the thermophilic Campylobactor. a monoclonal antibody was adsorbed on the surface of the magnetic beads which react against a major porin of 45kDa present on the surface of the cells(Huyer et al., 1986). After this partial purification and concentration step, detection of bound cells was achieved using a simple, inexpensive microtitre plate-based hybridization system. We examined two alternative detection systems, one specific for thermophilic Campylobactor based on the detection of 23S rRNA using an immobilized DNA probe. The second system is less specific but more sensitive because of the high copy number of the rRNA present in bacterial cell($10^3-10^4$). By using specific immunomagnetic beads against thermophilic Campylobactor, it was possible to concentrate these cells from a heterogeneous media and obtain highly specific hybridization reactions with good sensitivity. There are several advantages in using microtitre plates instead of filter membranes or other matrices for hybridization techniques. Microtitre plates are much easier to handle than filter membranes during the adsorption, washing, hybridization and detection steps, and their use faciilitates the simultanuous analysis of multiple sample. Here we report on the use of a very simple detection procedure based on a monoclonal anti-RNA-DNA hybrid antibody(Fliss et al., 1999) for detection of the RNA-DNA hybrids formed in the wells.

  • PDF

MALDI-TOF 질량분석기를 이용한 식품중독균 확인시험 적용 (Application of MALDI-TOF mass spectrometry-based identification of foodborne pathogen tests to the Korea Food Standard Codex)

  • 하미영;손은정;최은정
    • 한국식품과학회지
    • /
    • 제48권5호
    • /
    • pp.437-444
    • /
    • 2016
  • 최근 건강과 위생에 대한 소비자의 의식 향상으로 인해 농수축산 분야를 비롯한 식품의 가공 유통 분야에서도 식품의 안전성 확보를 위한 시험 검사가 실시되고 있고, HACCP과 같은 식품안전관리 프로그램의 조기 도입을 유도하고 있어 식품중독균에 대한 검사량이 증가하고 있다. 이에 따른 신속, 정확하고 대량의 시료를 처리할 수 있는 식품중독균 검사의 필요성이 증가되고 있다. 국내 식품 미생물의 확인시험방법은 전통적인 미생물 동정법인 그램 염색 등과 같은 형태학적 특성과 생화학적 분석에 의해서 주로 확인되는데, 확인 과정이 복잡하고 장시간이 소요된다. 이를 극복하기 위한 새로운 미생물 동정법인 MALDI-TOF 질량분석기반 미생물 동정법을 식품의 식품중독균 검사에 적용하기 위해 식품공전에서 주로 검사하는 식품중독균 10종에 대한 질량 패턴 데이터를 국내 질량분석 데이터베이스인 MicroID에 적용하였다. 표준 균주와 식품중독균이 검출된 시료에서 분리한 균으로 비교했을 때 질량분석기반 미생물 동정은 현재 사용되고 있는 생화학적 분석결과와 일치한 결과를 보여주었다. 또한, 식품중독균을 포함한 국내 미생물 균주를 이용해서 구축한 데이터베이스, MicroID는 기존의 상용화된 해외 MALDI-TOF 질량분석 데이터베이스 Biotyper와 동등 이상의 정확도를 나타내었다. 국내 식품관련 미생물에 대한 질량스펙트럼을 추가하여 데이터베이스를 지속적으로 확장시키면 신속 정확한 미생물 동정법으로 자리매김할 수 있을 것이다.

우리나라 도계장 수거계육의 미생물학적 위생실태 조사 (Survey on the Status of Microbial Contamination of Chicken Meats Collected from Poultry Processing Plants in Nationwide)

  • 우용구
    • 미생물학회지
    • /
    • 제43권3호
    • /
    • pp.186-192
    • /
    • 2007
  • 제주도를 포함한 전국규모로 15개 시 도에 위치한 도계장에서 직접 수거한 도계육에 대하여 미생물 오염도 조사로서 총세균수, 대장균군수 및 포도상구균수에 대해서 조사를 하였다. 특히 주요 인수공통 병원성 세균들인 Salmonella 속균과 Campylobacter jejuni, Listeria monocytogenes, Staphylococcus aureus, 그리고 E. coli O157:H7 균에 대해서도 함께 조사를 하였다. 그리고 도계장에서 보다 안전하고 위생적인 처리를 위해서 가장 흔히 사용되는 방법인 염소(20mg/L포함)를 첨가한 염소수로서 수세한 처리계육과 그렇지 않은 비처리 도계육 상호간에 대해서도 Salmonella 속균의 분리율과 기타 균종의 억제효과에 대해서도 비교조사를 수행하였다. 먼저 예비조사로서 강원지역을 비롯한 전국 6개 시 도의 도계장 유래 계육에 대해서 세균오염도의 비교조사에서는 포도상구균수, 대장균군수 및 총세균수의 순서로 오염도를 나타내었다. 이 성적은 시판계육의 미생물 오염도 수준보다는 $10{\sim}100$배 이상 낮은 오염도 성적이었다. 그리고 동일계육에 대한 Salmonella 속균의 분리율은 63.3%(19/30)였고, S. enteritidix (33.3%)가 가장 지배적인 혈청형이었으며, 동시에 S. typhimurium (3.3%), S. muenchen (30.0%)도 분리되었다. 하편, 염소수로 세척한 도계육은 총세균수와 대장균군수의 비교조사에서 비처리 계육보다도 약 100배정도로 균수의 억제효과를 보였다. 반면에 포도상구균수에서는 양자간에 뚜렷한 차이를 보이지 알았다. 또한 Salmonella 속균에 대한 억제효과의 비교조사에서도 20 ppm의 염소처리로서는 포도상구균과 마찬가지로 Salmonella 속균에 대해서도 뚜렷한 억제효과를 발휘하지 못한 것으로 확인되었다. 한편 보다 확대된 규모의 조사결과에서 제주도를 포함한 부산, 경남, 대구, 경북, 전남, 광주, 전북, 충남, 대전, 충북, 강원, 서울, 인천 및 경기지역을 포함하여 총 15개 시 도의 도계장 수거계육에서 Salmonella속균은 58.3%(67/115)에서 분리되었고, S. muenchen (57.3%)과 S. enteritidis (22.7%)가 대부분을 차지하였고, 인수공통병원균 중에서는 L. monocytogenes(43.5%), C. jejuni(37.4%), S. aureus(30.4%)의 순서로 분리되었으나, E. coli O157:H7은 국내 계육에서 전혀 분리되지 않았다. 결과적으로 도계육이 위생적이며 안전하게 시판되기 위해서는 최종적인 도계공정 이후 다양한 유통과정에서 발생될 수 있는교차 및 추가오염의 기회를 줄이기 위한 보다 철저한 위생관리 대책과 보완대책이 필요하다는 사실을 이 성적을 통하여 비로소 확인할 수 있었다.

한국과 일본의 식중독 발생 역학의 비교연구 (Comparative Study on the Epidemiology of Food-Borne Disease Outbreaks in Korea and Japan)

  • 황선영;문보연;박용호;이명진;방형애;임국환;김진석;최농훈;이원창
    • 한국식품위생안전성학회지
    • /
    • 제25권2호
    • /
    • pp.129-132
    • /
    • 2010
  • The epidemiology of reported food-borne disease (FBD) outbreaks from 2001 to 2008 in Korea nd Japan were compared in this study. The outbreak rate of FBD in Japan was significantly higher although the average umber of patient in each outbreak in Korea was much higher. In both countries, summer was the season when most FBD outbreaks occurred. The comparison study revealed that FBD outbreaks in spring were more frequent in Korea, and outbreaks in winter were more frequent in Japan. Almost half of FBD outbreaks were observed at restaurants in both countries while FBD outbreaks at schools and work-places in Korea were much higher than in Japan. The most frequent cause of bacterial FBDs in Korea was pathogenic Escherichia coli followed by Salmonella species. On the other hand, Campylobacter jejuni was the most frequent source of bacterial FBDs in Japan. Norovirus, which is elated to uncontrolled hand hygiene and involvement of ill food workers, was the main cause of viral FBDs in both countries. In conclusion, there are common epidemiological characteristics as well as several differences in FBD outbreaks of Korea and Japan. These are suggested to be originated from the characteristic of climate, food sources, and life styles in two countries. Establishment of stricter control and surveillance system for FBD outbreaks are required or prevention and reduction of FBD outbreaks in both countries.

Simultaneous Detection of 10 Foodborne Pathogens using Capillary Electrophoresis-Based Single Strand Conformation Polymorphism

  • Oh, Mi-Hwa;Hwang, Hee-Sung;Chung, Bo-Ram;Paik, Hyun-Dong;Han, Sang-Ha;Kang, Sun-Moon;Ham, Jun-Sang;Kim, Hyoun-Wook;Seol, Kuk-Hwan;Jang, Ae-Ra;Jung, Gyoo-Yeol
    • 한국축산식품학회지
    • /
    • 제32권2호
    • /
    • pp.241-246
    • /
    • 2012
  • This report outlines the development of a rapid, simple, and sensitive detection system for pathogenic bacteria using a capillary electrophoresis-based, single strand conformation polymorphism (CE-SSCP) combined with PCR. We demonstrate that this method, used with primers targeting the V4 region of the16S rRNA gene, is capable of the simultaneous detection of 10 microbes that could be associated with foodborne illness, caused by animal-derived foods: Salmonella enterica, Listeria monocytogenes, Escherichia coli O157:H7, Campylobacter jejuni, Staphylococcus aureus, Bacillus cereus, Clostridium perfringens, Yersinia enterocolitica, Vibrio parahaemolyticus, and Enterobacter sakazakii. The traditional detection techniques are time-consuming and labor-intensive, due to the necessary task of separate cultivation of each target species. As such, the CE-SSCP-PCR method, that we have developed, has the potential to diagnose pathogens rapidly, unlike the traditional technique, in order to prevent foodborne illness in a much more efficient manner.

Efficacy of salivary versus subgingival bacterial sampling for the detection and quantification of periodontal pathogens

  • Lee, Yoonsub;Hong, Yoojin;Kim, Bome;Lee, Dajung;Kim, Sungtae;Rhyu, In-chul
    • Journal of Periodontal and Implant Science
    • /
    • 제50권6호
    • /
    • pp.358-367
    • /
    • 2020
  • Purpose: The aim of this study was to investigate the efficacy and validity of subgingival bacterial sampling using a retraction cord, and to evaluate how well this sampling method reflected changes in periodontal conditions after periodontal therapy. Methods: Based on clinical examinations, 87 subjects were divided into a healthy group (n=40) and a periodontitis group (n=47). Clinical measurements were obtained from all subjects including periodontal probing depth (PD), bleeding on probing (BOP), clinical attachment loss (CAL), and the plaque index. Saliva and gingival crevicular fluid (GCF) as a subgingival bacterial sample were sampled before and 3 months after periodontal therapy. The salivary and subgingival bacterial samples were analyzed by reverse-transcription polymerase chain reaction to quantify the following 11 periodontal pathogens: Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Tannerella forsythus (Tf), Treponema denticola (Td), Prevotella intermedia (Pi), Fusobacterium nucleatum (Fn), Pavimonas micra (Pm), Campylobacter rectus (Cr), Prevotella nigrescens (Pn), Eikenella corrodens (Ec), and Eubacterium nodatum (En). Results: Non-surgical periodontal therapy resulted in significant decreases in PD (P<0.01), CAL (P<0.01), and BOP (P<0.05) after 3 months. Four species (Pg, Tf, Pi, and Pm) were significantly more abundant in both types of samples in the periodontitis group than in the healthy group. After periodontal therapy, Cr was the only bacterium that showed a statistically significant decrease in saliva, whereas statistically significant decreases in Cr, Pg, and Pn were found in GCF. Conclusions: Salivary and subgingival bacterial sampling with a gingival retraction cord were found to be equivalent in terms of their accuracy for differentiating periodontitis, but GCF reflected changes in bacterial abundance after periodontal therapy more sensitively than saliva.

Immediate effect of Nd:YAG laser monotherapy on subgingival periodontal pathogens: a pilot clinical study

  • McCawley, Thomas K.;McCawley, Mark N.;Rams, Thomas E.
    • Journal of Periodontal and Implant Science
    • /
    • 제52권1호
    • /
    • pp.77-87
    • /
    • 2022
  • Purpose: This pilot study assessed the immediate in vivo effect of high peak pulse power neodymium-doped yttrium aluminum garnet (Nd:YAG) laser monotherapy on selected red/orange complex periodontal pathogens in deep human periodontal pockets. Methods: Twelve adults with severe periodontitis were treated with the Laser-Assisted New Attachment Procedure (LANAP®) surgical protocol, wherein a free-running, digitally pulsed, Nd:YAG dental laser was used as the initial therapeutic step before mechanical root debridement. Using a flexible optical fiber in a handpiece, Nd:YAG laser energy, at a density of 196 J/cm2 and a high peak pulse power of 1,333 W/pulse, was directed parallel to untreated tooth root surfaces in sequential coronal-apical passes to clinical periodontal probing depths, for a total applied energy dose of approximately 8-12 joules per millimeter of periodontal probing depth at each periodontal site. Subgingival biofilm specimens were collected from each patient before and immediately after Nd:YAG laser monotherapy from periodontal pockets exhibiting ≥6 mm probing depths and bleeding on probing. Selected red/orange complex periodontal pathogens (Porphyromonas gingivalis, Tannerella forsythia, Prevotella intermedia/nigrescens, Fusobacterium nucleatum, Parvimonas micra, and Campylobacter species) were quantified in the subgingival samples using established anaerobic culture techniques. Results: All immediate post-treatment subgingival biofilm specimens continued to yield microbial growth after Nd:YAG laser monotherapy. The mean levels of total cultivable red/orange complex periodontal pathogens per patient significantly decreased from 12.0% pretreatment to 4.9% (a 59.2% decrease) immediately after Nd:YAG laser monotherapy, with 3 (25%) patients rendered culture-negative for all evaluated red/orange complex periodontal pathogens. Conclusions: High peak pulse power Nd:YAG laser monotherapy, used as the initial step in the LANAP® surgical protocol on mature subgingival biofilms, immediately induced significant reductions of nearly 60% in the mean total cultivable red/orange complex periodontal pathogen proportions per patient prior to mechanical root instrumentation and the rest of the LANAP® surgical protocol.

주요 식중독 원인 미생물들에 대한 용량-반응 모델 연구 (A Study on Dose-Response Models for Foodborne Disease Pathogens)

  • 박명수;조준일;이순호;박경진
    • 한국식품위생안전성학회지
    • /
    • 제29권4호
    • /
    • pp.299-304
    • /
    • 2014
  • 본 연구는 정량적 미생물 위해평가(Quantitative microbial risk assessment: QMRA)에 절대적으로 필요하지만 국내의 경우 관련 정보 및 자료가 부족한 주요 식중독 원인 미생물에 대한 용량-반응모델(dose-response models) 관련 자료를 수집 정리하여 가장 적합한 용량-반응 모델을 분석 및 선정하였다. 1980년부터 2012년까지 식중독 발생과 관련이 있는 26종의 세균, 9종의 바이러스, 8종의 원생동물관련 용량-반응 모델 및 위해평가 자료들을 중심으로 국내 NDSL (National Digital Science Library), 국외 PubMed, ScienceDirect database에서 총 193개의 논문을 추출하여 정리하였다. 조사된 자료로부터 세균별, 바이러스별, 원생동물별 용량-반응 모델의 미생물 위해평가 활용여부를 확인하고, 위해평가에 활용된 모델들을 메타분석(meta-analysis)에서 사용되고 있는 Relative frequency (fi, 상대빈도 값)를 계산하여 가장 적정한 용량-반응 모델을 제시하였다. 주요 식중독 원인 미생물들인 Campylobacter jejuni, pathogenic E. coli O157:H7 (EHEC / EPEC / ETEC), Listeria monocytogenes, Salmonella spp., Shigella spp., Staphylococcus aureus, Vibrio parahaemolyticus, Vibrio cholera, Rota virus, Cryptosporidium pavum의 적정 용량-반응 모델은 beta-poisson (${\alpha}=0.15$, ${\beta}=7.59$, fi = 0.72), beta-poisson (${\alpha}=0.49$, ${\beta}=1.81{\times}10^5$, fi = 0.67) / beta-poisson (${\alpha}=0.22$, ${\beta}=8.70{\times}10^3$, fi = 0.40) / beta-poisson (${\alpha}=0.18$, ${\beta}=8.60{\times}10^7$, fi = 0.60), exponential ($r=1.18{\times}10^{-10}$, fi = 0.14), beta-poisson (${\alpha}=0.11$, ${\beta}=6,097$, fi = 0.09), beta-poisson (${\alpha}=0.21$, ${\beta}=1,120$, fi = 0.15), exponential ($r=7.64{\times}10^{-8}$, fi = 1.00), beta-poisson (${\alpha}=0.17$, ${\beta}=1.18{\times}10^5$, fi = 1.00), beta-poisson (${\alpha}=0.25$, ${\beta}=16.2$, fi = 0.57), exponential ($r=1.73{\times}10^{-2}$, fi = 1.00), and exponential ($r=1.73{\times}10^{-2}$, fi = 0.17)로 각각 선정하였다. 본 연구에서 제시된 용량-반응 모델들은 향후 국내 QMRA 관련 연구 및 진행에 많은 도움이 될 것으로 기대된다.

소아 급성 위장관염에서의 원인과 임상양상 (Etiology and Clinical Manifestation of Acute Gastroenteritis in Children)

  • 임익재;이미정;정은희;유지숙;장영표;박우성;박귀성;송낙수;백경아;차윤태
    • Pediatric Infection and Vaccine
    • /
    • 제13권2호
    • /
    • pp.147-155
    • /
    • 2006
  • 목 적 : 소아에서 흔한 감염성 질환인 급성 위장관염은 바이러스, 원충, 세균 등 다양한 원인에 의해 발생한다. 소아 위장관염의 다양한 원인에 대한 연구가 드물어 이에 급성 위장관염으로 방문했던 환아들을 대상으로 병원체의 원인과 임상양상에 대해 연구하고자 하였다. 방 법 : 2004년 12월부터 2005년 12월까지 설사, 구토 등의 위장관염 증상으로 단국대학교병원 외래를 내원하였거나 입원한 환아들을 대상으로 하였다. 대변검사는 총 17종의 원인 병원체에 대한 검사를 하였다. RT-PCR에 의한 norovirus, ELISA에 의한 rotavirus, astrovirus, adenovirus와 선택적 배지를 사용하여 Salmonella spp., Shigella spp., C. perfrigens, Campylobacter spp., E. coli, Vibrio spp., S. aureus, B. cereus, Yersinia spp., L. monocytogenes에 대한 배양검사, EIA에 의한 C. parvum, E. histolytica, G. lamblia에 대한 검사를 하였다. 원인별 임상양상에 대해 후향적으로 의무기록지를 검토하였다. 결 과 : 총 215례 환아에서 대변검사를 시행하였으며 이중 89례(41.4%)가 양성을 보였다. 89례의 남녀비는 1.3:1, 평균나이는 25개월(3일~14세), 평균 입원기간은 3.4일(1~10일)이었다. 연령별로 1개월 미만이 4례(4.5%), 1~2개월이 4례(4.5%), 3~12개월 24례(26.7%)였고 13~48개월이 47례(52.8%)로 가장 많았으며 4세 이상이 10례(11.2%)의 분포를 보였다. 원인별로 바이러스가 68례(77.5%), 세균이 26례(28.9%), 원충이 21례(23.6%)에서 검출되었고 바이러스류에서는 rotavirus(50례), 세균류에서는 salmonella(10례), 원충류에서는 C. parvum(11례)이 가장 많이 검출되었다. 양성 환아의 22례(24.4%)에서 2종 이상의 혼합감염을 보였고 바이러스와 원충의 혼합감염이 가장 많았다. 결 론 : 본 연구에서 소아 급성 위장관염을 일으키는 것으로 알려진 다양한 병원체들이 검출되었다. 이는 소아 급성 위장관염의 치료에 많은 정보를 줄 것으로 생각되며 향후 소아 급성 위장관염의 다양한 원인에 대한 광범위하고 지속적인 연구가 필요할 것으로 사료된다.

  • PDF