• Title/Summary/Keyword: Campylobacter jejuni

Search Result 113, Processing Time 0.134 seconds

Adhesion control of Campylobacter jejuni in chicken skin using emulsifiers (유화제를 이용한 계육 표면에서 Campylobacter jejuni의 부착 제어)

  • Oh, Do Geon;Kim, Kwang Yup
    • Korean Journal of Food Science and Technology
    • /
    • v.52 no.6
    • /
    • pp.670-677
    • /
    • 2020
  • To prevent contamination by Campylobacter jejuni during chicken carcass processing, the effect of emulsifiers on C. jejuni inoculated on chicken skin was investigated using confocal laser scanning microscopy. Among the 8 emulsifiers (SWA-10D, L-7D, M-7D, S-1670, L-1695, P-1670, polysorbate 20, polysorbate 80) tested for antimicrobial activity by the paper disk method, 4 emulsifiers (L-7D, L-1695, polysorbate 20, polysorbate 80) were screened further. Emulsifier L-1695 showed the largest clear zone at a concentration of 200 mg/mL. The 4 emulsifiers subjected to primary screening were screened for heat and pH stability. In the contact surface test, emulsifier L-1695 showed the lowest log CFU/㎠ value on both stainless steel and ceramic surfaces. When emulsifier L-1695 was applied via general and electrostatic spray methods, the number of C. jejuni entrapped inside chicken skin follicles was significantly reduced in both methods. In conclusion, the emulsifier L-1695 could be employed as a microbial detachment agent in the chicken carcass processing industry.

In Vitro Antagonistic Activity Evaluation of Lactic Acid Bacteria (LAB) Combined with Cellulase Enzyme Against Campylobacter jejuni Growth in Co-Culture

  • Dubois-Dauphin, Robin;Sabrina, Vandeplas;Isabelle, Didderen;Christopher, Marcq;Andre, Thewis;Philippe, Thonart
    • Journal of Microbiology and Biotechnology
    • /
    • v.21 no.1
    • /
    • pp.62-70
    • /
    • 2011
  • The antibacterial effects of nine lactic acid bacteria (LAB) against Campylobacter jejuni were investigated by using agar gel diffusion and co-culture assays. Some differences were recorded between the inhibition effects measured with these two methods. Only two LAB, Lb. pentosus CWBI B78 and E. faecium THT, exhibited a clear anti- Campylobacter activity in co-culture assay with dehydrated poultry excreta mixed with ground straw (DPE/GS) as the only growth substrate source. It was observed that the supplementation of such medium with a cellulase A complex (Beldem S.A.) enhanced the antimicrobial effect of both LAB strains. The co-culture medium acidification and the C. jejuni were positively correlated with the cellulase A concentration. The antibacterial effect was characterized by the lactic acid production from the homofermentative E. faecium THT and the lactic and acetic acids production from the heterofermentative Lb. pentosus CWBI B78. The antagonistic properties of LAB strains and enzyme combination could be used in strategies aiming at the reduction of Campylobacter prevalence in the poultry production chain and consequently the risk of human infection.

Comparison of Multilocus Sequence Typing (MLST) and Repetitive Sequence-Based PCR (rep-PCR) Fingerprinting for Differentiation of Campylobacter jejuni Isolated from Broiler in Chiang Mai, Thailand

  • Patchanee, Prapas;Chokboonmongkol, Chomporn;Zessin, Karl-Hans;Alter, Thomas;Pornaem, Sarinya;Chokesajjawatee, Nipa
    • Journal of Microbiology and Biotechnology
    • /
    • v.22 no.11
    • /
    • pp.1467-1470
    • /
    • 2012
  • We compared rapid fingerprinting using repetitive sequencebased PCR (rep-PCR) for subtyping Campylobacter jejuni isolates to the widely used multilocus sequence typing (MLST). Representative C. jejuni isolates (n = 16) from broilers were analyzed using MLST and rep-PCR. Both techniques demonstrated an equal discriminatory power of 0.8917, and 9 subgroups were identified. Clonal identification of all 16 isolates was identical for both techniques. The rep-PCR as described in this study may be used as a rapid and cost-effective alternative for subtyping of C. jejuni isolates, or as an effective screening tool in large epidemiological studies.

Survival of Campylobacter jejuni under Aerobic Condition (인체장염유발 Campylobacter jejuni의 호기적 조건 하에서의 잔존 양상)

  • Shin, Soon-Young;Kim, Kwang-Yup;Park, Jong-Hyun
    • Korean Journal of Food Science and Technology
    • /
    • v.30 no.4
    • /
    • pp.916-923
    • /
    • 1998
  • To provide more information on the enteric pathogen Campylobacter jejuni in the view of food sanitation, survival characteristics of two strains of C. jejuni in the different conditions were investigated. When $10^7{\;}or{\;}10^3{\;}per{\;}ml$ of C. jejuni cells were inoculated in the supplemented Brucella broth and kept at $42^{\circ}C,{\;}25^{\circ}C{\;}and{\;}5^{\circ}C$ under the static aerobic condition for 7 days, organisms exponentially proliferated to $a{\;}>10^8$, even in the $10^3{\;}per{\;}ml$ inoculated-sample at $42^{\circ}C{\;}for{\;}1{\sim}2{\;}days$ and the considerable level of viability maintained during 7 days. At $5^{\circ}C$, most of the initial level of organisms survived at the early period and only $a{\;}<{\;}0.5-log_{10}$ cells decrease were observed during the 7 days. At $25^{\circ}C$, a remarkable number of C. jejuni declined within $1{\sim}2{\;}days$ and showed undetectable level of cells after 4 days. When sterile milk and minced chicken meat were artifically inoculated with $10^7{\;}per{\;}ml$ of C. jejuni, mostly, a $1-to{\;}2-log_{10}$ count decrease occurred at $42^{\circ}C{\;}and{\;}5^{\circ}C$ while $a{\;}>3{\;}log_{10}$ decrease at $25^{\circ}C$ during 7 days. Unexpectedly, no colonies appeared on the plate inoculated from the minced chicken meat sample kept at $42^{\circ}C$ after 4 days. The results suggest that C. jejuni contaminated to food can survive at the refrigeration temperature whereas they are sensitive to at the room temperature. Also, it is shown that the growth of C. jejuni at the optimal temperature may vary to the food sources.

  • PDF

Microbial Contamination in Kitchens and Refrigerators of Korea Households

  • Hong, Joonbae;Lim, Seung-Yong
    • Journal of Food Hygiene and Safety
    • /
    • v.30 no.4
    • /
    • pp.303-308
    • /
    • 2015
  • The objectives of this study were to investigate the microbial contamination level of domestic kitchen environments and to provide information to improve food safety in 50 domestic house kitchens located in Seoul, Incheon, and Gyeonggi-do. Dishcloth, chopping board, and refrigerator swabs were examined for the presence of coliforms, Salmonella spp., Campylobacter jejuni/coli, Escherichia coli, Listeria monocytogenes, and Staphylococcus aureus. The means and standard deviations of coliform counts for dishcloths was $4.8{\pm}1.84log\;CFU/100g$, chopping boards, and refrigerator drawers were $4.04{\pm}1.53$, $4.11{\pm}1.65log\;CFU/100cm^2$, respectively. Salmonella spp. and Campylobacter jejuni/coli were not detected in all samples. E. coli were detected in 3 on the dishcloths and 1 of 50 samples in the refrigerator drawer. Listeria monocytogenes was detected in the drawer of the refrigerator in 2 of 50 samples. In the case of Staphylococcus aureus, the detection on dishcloths, chopping boards, and drawers in refrigerators was 21, 12, and 14 of 50 samples, respectively. The results of microbiological tests of domestic kitchen utensils can be used to emphasize the importance of the sanitary conditions in domestic kitchen environments.

The Effect of Fermented Extracts of Portulaca oleracea against Campylobacter jejuni (쇠비름 추출물 발효액이 Campylobacterjejuni의 증식에 미치는 영향)

  • Bae, Ji-Hyun
    • The Korean Journal of Food And Nutrition
    • /
    • v.25 no.2
    • /
    • pp.291-298
    • /
    • 2012
  • One of the main microorganisms causing diarrheal diseases is Campylobacter jejuni. Purslane or Portulaca oleracea is an edible plant containing polyphenols that has been widely used as a folk remedy for treatment of diarrhea for a long time. This study was performed to investigate the antimicrobial activity of fermented P. oleracea extracts made with probiotics and plant-origin lactic acid bacteria(PLAB) isolated from P. oleracea against C. jejuni. Lactobacillus rhamnosus, L. acidophilus, L. bulgaricus, L. delbrueckii, L. plantarum, Leuconostoc mesenteroides and Bifidobacterium longum were applied to P. oleracea to make a fermentation broth of purslane. Leuconostoc mesenteroides and the lactic acid bacteria isolated from P. oleracea grew best in the fermentation broth of P. oleracea extracts when the broth was combined with 2% yeast extract, 1% peptone, and 0.05 to 1% potassium phosphate. The number of viable cells in the fermentation broth containing purslane extracts after 48 hours increased to $1{\times}10^{12}\;CFU/m{\ell}$ and remained at $1.3{\times}10^{10}\;CFU/m{\ell}$ after refrigeration for 2 weeks. The pH and acidity of purslane-fermented broth after 48 hours of fermentation was 3.7 and 3.14, respectively, which show that the fermentation broth was within the range of the general standards of fermented dairy products. The antimicrobial activity of the fermented P. oleracea extracts was determined using the liquid culture method. The 10 $mg/m{\ell}$ concentration of the fermented P. oleracea extract made with Leuconostoc mesenteroides and the lactic acid bacteria isolated from purslane showed the strongest antimicrobial activity against C. jejuni. The fermentation broth of purslane with the probiotics retarded the growth of C. jejuni for 48 hours at $42^{\circ}C$.

Use of In Vivo-Induced Antigen Technology to Identify In Vivo-Expressed Genes of Campylobacter jejuni During Human Infection

  • Hu, Yuanqing;Huang, Jinlin;Li, Qiuchun;Shang, Yuwei;Ren, Fangzhe;Jiao, Yang;Liu, Zhicheng;Pan, Zhiming;Jiao, Xin-An
    • Journal of Microbiology and Biotechnology
    • /
    • v.24 no.3
    • /
    • pp.363-370
    • /
    • 2014
  • Campylobacter jejuni is a prevalent foodborne pathogen worldwide. Human infection by C. jejuni primarily arises from contaminated poultry meats. Genes expressed in vivo may play an important role in the pathogenicity of C. jejuni. We applied an immunoscreening method, in vivo-induced antigen technology (IVIAT), to identify in vivo-induced genes during human infection by C. jejuni. An inducible expression library of genomic proteins was constructed from sequenced C. jejuni NCTC 11168 and was then screened using adsorbed, pooled human sera obtained from clinical patients. We successfully identified 24 unique genes expressed in vivo. These genes were implicated in metabolism, molecular biosynthesis, genetic information processing, transport, and other processes. We selected six genes with different functions to compare their expression levels in vivo and in vitro using real-time RT-PCR. The results showed that the selected six genes were significantly upregulated in vivo but not in vitro. In short, these identified in vivo-induced genes may contribute to human infection of C. jejuni, some of which may be meaningful vaccine candidate antigens or diagnosis serologic markers for campylobacteriosis. IVIAT may present a significant and efficient method for understanding the pathogenicity mechanism of Campylobacter and for finding targets for its prevention and control.

Quantitative microbial risk assessment of Campylobacter jejuni in jerky in Korea

  • Ha, Jimyeong;Lee, Heeyoung;Kim, Sejeong;Lee, Jeeyeon;Lee, Soomin;Choi, Yukyung;Oh, Hyemin;Yoon, Yohan
    • Asian-Australasian Journal of Animal Sciences
    • /
    • v.32 no.2
    • /
    • pp.274-281
    • /
    • 2019
  • Objective: The objective of this study was to estimate the risk of Campylobacter jejuni (C. jejuni) infection from various jerky products in Korea. Methods: For the exposure assessment, the prevalence and predictive models of C. jejuni in the jerky and the temperature and time of the distribution and storage were investigated. In addition, the consumption amounts and frequencies of the products were also investigated. The data for C. jejuni for the prevalence, distribution temperature, distribution time, consumption amount, and consumption frequency were fitted with the @RISK fitting program to obtain appropriate probabilistic distributions. Subsequently, the dose-response models for Campylobacter were researched in the literature. Eventually, the distributions, predictive model, and dose-response model were used to make a simulation model with @RISK to estimate the risk of C. jejuni foodborne illness from the intake of jerky. Results: Among 275 jerky samples, there were no C. jejuni positive samples, and thus, the initial contamination level was statistically predicted with the RiskUniform distribution [RiskUniform (-2, 0.48)]. To describe the changes in the C. jejuni cell counts during distribution and storage, the developed predictive models with the Weibull model (primary model) and polynomial model (secondary model) were utilized. The appropriate probabilistic distribution was the BetaGeneral distribution, and it showed that the average jerky consumption was 51.83 g/d with a frequency of 0.61%. The developed simulation model from this data series and the dose-response model (Beta Poisson model) showed that the risk of C. jejuni foodborne illness per day per person from jerky consumption was $1.56{\times}10^{-12}$. Conclusion: This result suggests that the risk of C. jejuni in jerky could be considered low in Korea.

Prevalence and Drug Susceptibility of Campylobacter jejuni and Campylobacter coli in Korean Native Goats (한국 재래산양에서 있어서 Campylobacter jejuni 및 Campylobacter coli의 분포와 약제감수성)

  • Kang, Ho-jo;Kim, Yong-hwan;Cho, Hyun-ho
    • Korean Journal of Veterinary Research
    • /
    • v.27 no.2
    • /
    • pp.227-233
    • /
    • 1987
  • This study was conducted to determine the epidemiological characteristics of Campylobacter enteritis. A total of 187 fecal specimens of Korean native goat were examined for the presence of C. jejuni and C. coli by direct plating. Fifty strains isolated were examined for biochemical and serological properties and susceptibility to 19 chemotherapeutic agents. A total of 29(15.5%) C. jejuni and 21 (11.2%) C. coli were isolated from the fecal specimen of 187 Korean native goats. Of the 50 isolates of C. jejuni and C. coli, 29 isolates of C. jejuni grouped as 7 biotypes (1,2,3,4,6,7 and 8) and biotypes 1(34.5%), 2(17.2%) and 3(20.7%) were encountered most frequently. Twenty-one C. coli strains were differentated into biotype I (61.9% of the isolates) and biotype II (38.1%). Of the 29 C. jejuni strains examined, 24(83.0%) were typable by the Lior serotyping scheme and five isolates were non typable. C. jejuni grouped as 8 serotypes, serotype 4(24.1%) and 26(20.7%) were encountered most frequently. In the case of 21 strains of C. coli grouped as 6 serotypes, the most frequent serotypes were 21(28.6%) and 25(23.8%). Total of 50 strains of isolated were all susceptible to amikacin, clindamycin and tobramycine. Overall 85% of isolates were sensitive to erythromycin, doxycycline, chloramphenicol, flume-quine, kanamycin, gentamicin, nalidixic acid, polymyxin B, colistin, tetracycline and ampicillin, but about 65% of isolates were resistant to cefamandole and ethyl hydrocuprein hydrochloride.

  • PDF