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Kim J, Guk JH, Mun SH, An JU, Song H, Kim J, Ryu S, Jeon B, Cho S. Metagenomic analysis of isolation methods of a targeted microbe, Campylobacter jejuni, from chicken feces with high microbial contamination. MICROBIOME 2019; 7:67. [PMID: 31027515 PMCID: PMC6485176 DOI: 10.1186/s40168-019-0680-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 04/04/2019] [Indexed: 05/06/2023]
Abstract
BACKGROUND Originating from poultry, particularly chickens, Campylobacter jejuni is the leading foodborne pathogen worldwide and a major cause of campylobacteriosis. Isolating C. jejuni is difficult due to its specific growth requirements, the presence of viable but non-culturable bacteria, and because it is often masked by competing flora. Currently, there is no optimized method for isolating C. jejuni from chicken feces. Here, we evaluated the method for isolating C. jejuni from chicken feces using culture-independent sequence-based metagenomics and culture-dependent tools. Further, we assessed changes in microbial communities during microbe isolation to determine how the process can be improved. RESULTS Fourteen different variations of C. jejuni isolation procedures were applied to all 35 chicken fecal samples. These variations included using different enrichment broths (without enrichment or enrichment in Bolton or Preston broth), different ratios of sample-to-enrichment broth (1:101, 1:102, and 1:103), and different selective agars (modified charcoal-cefoperazone-deoxycholate agar (mCCDA) or Preston agar). Enrichment during isolation of C. jejuni was evaluated on the basis of microbial diversity and taxonomic composition using metagenomics tools. The effect of selective media was evaluated using a combination of metagenomics and culture-dependent tools. Microbial diversity significantly decreased during the enrichment process, regardless of the type of enrichment broth, with the most significant decrease observed at a feces-to-broth ratio of 1:103. Particularly, in 103-Preston broth, the relative abundance of Campylobacter increased, while extended-spectrum beta-lactamase-producing Escherichia coli, which interfere with Campylobacter isolation, decreased. Metagenomics results were validated by quantitative PCR and culture-dependent analysis. Additionally, selective media affected the isolation results, although microbes with high relative abundance during enrichment were also frequently isolated using culture-dependent methods. Significantly more C. jejuni was isolated from mCCDA than from Preston agar enriched in 103 Preston broth. CONCLUSIONS Enrichment in Preston broth at a ratio of 1:103 followed by spreading onto mCCDA was the most effective method for isolating C. jejuni. This is the first study to apply metagenomics to evaluate a method for isolating a targeted microbe, C. jejuni, from chicken feces, a source with high microbial contamination. Thus, metagenomics can be applied to improve methods for isolating bacteria that are difficult to separate.
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Affiliation(s)
- Junhyung Kim
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Jae-Ho Guk
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Seung-Hyun Mun
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Jae-Uk An
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Hyokeun Song
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Jinshil Kim
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute for Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul, Republic of Korea
| | - Sangryeol Ryu
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute for Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul, Republic of Korea
| | - Byeonghwa Jeon
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute for Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul, Republic of Korea
- School of Public Health, University of Alberta, Edmonton, Alberta Canada
| | - Seongbeom Cho
- Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
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Tejada TS, Timm CD. EFICIÊNCIA DE DIFERENTES PROTOCOLOS PARA ISOLAMENTO DE Campylobacter jejuni DE CARNE DE FRANGO. CIÊNCIA ANIMAL BRASILEIRA 2019. [DOI: 10.1590/1809-6891v20e-41297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Resumo Campylobacter jejuni é o principal causador de gastroenterite bacteriana aguda e a carne de frango é um importante veículo do agente. Entretanto, as metodologias convencionais de isolamento de Campylobacter muitas vezes não são eficientes, podendo levar a resultados errôneos. Sendo assim, este trabalho teve como objetivo avaliar diferentes métodos utilizados na detecção de C. jejuni em produtos de frango. Carne moída experimentalmente contaminada com três diferentes diluições do microrganismo foi analisada com diferentes protocolos para isolamento de C. jejuni. Foram feitas semeaduras diretamente nos ágares mCCDA, Columbia e ágar sangue, e após pré-enriquecimento nos caldos Bolton ou Brucella. As colônias características de Campylobacter foram identificadas e os resultados comparados a fim de avaliar qual o método foi mais eficaz. Os únicos protocolos em que foi possível recuperar o microrganismo de todos os testes foram aqueles em que foi utilizado o ágar mCCDA associado com o Caldo Bolton ou com o Caldo Brucella. Estes foram também os únicos protocolos que permitiram a recuperação de C. jejuni 24 horas após a contaminação experimental com inóculo igual a 100 UFC/25 g. Entretanto, o ágar mCCDA sem o uso de pré-enriquecimento apresentou desempenho insatisfatório, inferior ao dos demais protocolos. Conclui-se que ágar mCCDA com pré-enriquecimento em caldo Brucella ou em caldo Bolton foram mais eficientes para o isolamento de C. jejuni que os demais protocolos.
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Kim YJ, Kim HS, Chon JW, Kim DH, Hyeon JY, Seo KH. New colorimetric aptasensor for rapid on-site detection of Campylobacter jejuni and Campylobacter coli in chicken carcass samples. Anal Chim Acta 2018; 1029:78-85. [PMID: 29907294 DOI: 10.1016/j.aca.2018.04.059] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 04/19/2018] [Indexed: 12/23/2022]
Abstract
Campylobacter is the most common cause of infectious intestinal disease, with nearly all cases caused by two species: C. jejuni and C. coli. We recently reported a gold nanoparticle-based two-stage aptasensing platform, which was improved in the present study for the rapid and on-site detection of both C. jejuni and C. coli in food samples. Compared to the previous platform, the improved platform yielded a more obvious colour change from red to purple due to the aggregation of gold nanoparticles, and does not require additional time or a pH optimization step for the aptamers to be adsorbed onto the gold nanoparticles. Using a highly specific aptamer that binds to live C. jejuni and C. coli, the improved aptasensor was highly effective for testing pure culture samples. The accuracy of the newly developed platform was comparable (p = 0.688) to that of the gold-standard detection method of tazobactam-supplemented culture, whereas it was superior to the official agar-based detection method (p = 0.016) in a validation study with 50 naturally contaminated chicken carcass samples. This is the first study on a colorimetric sensor that targets both live C. coli and C. jejuni in naturally contaminated samples. In addition, we provide the first evidence that both morphological status and the amount of Campylobacter present play key roles in the effectiveness of colorimetric detection. Thus, suitable selection of an antibody or aptamer with consideration of the morphological status of pathogens in samples is essential for direct detection without enrichment. Our data suggest that the sensor developed in this study can provide an excellent screening method, with a reduction in the detection time from 48 h to 30 min after enrichment, thus saving time, labour, and cost.
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Affiliation(s)
- Young-Ji Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea
| | - Hong-Seok Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea.
| | - Jung-Whan Chon
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea
| | - Dong-Hyeon Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea
| | - Ji-Yeon Hyeon
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea
| | - Kun-Ho Seo
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, South Korea.
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Chon JW, Kim YJ, Rashid F, Sung K, Khan S, Kim H, Seo KH. Improvement of Bolton broth by supplementation with tazobactam for the isolation of Campylobacter from chicken rinses. Poult Sci 2018; 97:289-293. [PMID: 29112760 DOI: 10.3382/ps/pex169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 10/19/2017] [Indexed: 11/20/2022] Open
Abstract
Overgrowth of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli (E. coli) on Campylobacter media prevents the latter's selective isolation, thereby making the improvement of Campylobacter-selective media necessary. We evaluated tazobactam (an ESBL inhibitor) to supplement Bolton enrichment broth (Tz-Bolton broth) for the selective isolation of Campylobacter in chicken carcass rinses. First, using 20 strains of ESBL-producing E. coli and 13 Campylobacter strains, we found 4 μg/mL of tazobactam to be optimal for inhibiting the ESBL-producing E. coli while allowing the growth of all tested Campylobacter strains. Next, 80 whole chicken carcasses were rinsed with buffered peptone water (BPW), and 25 mL of BPW rinse was mixed with 2 × blood-free Bolton broth (25 mL) with or without tazobactam followed by incubation at 42°C for 48 h under microaerobic conditions. A loopful of the incubated broth was inoculated on modified charcoal-cefoperazone-deoxycholate agar (mCCDA) and microaerobically incubated at 42°C for 48 h. The tazobactam supplemented Bolton broth showed a higher Campylobacter isolation rate (38.8%, p < 0.05) than normal Bolton broth (15%). Moreover, the number of mCCDA plates with non-Campylobacter was much lower (p < 0.05) after enrichment in Tz-Bolton broth (0%) than in the normal Bolton broth (80%), suggesting that selectivity of the modified broth was superior to normal Bolton broth.
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Affiliation(s)
- Jung-Whan Chon
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
| | - Young-Ji Kim
- KU center for One Health, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea
| | - Farzana Rashid
- Department of Zoology, Lahore College for Women University, Jail Road, Lahore, Pakistan
| | - Kidon Sung
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
| | - Saeed Khan
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
| | - Hyunsook Kim
- Department of Food & Nutrition College of Human Ecology Hanyang University 222 Wangsimni-ro, Seongdong-gu, Seoul, Republic of Korea
| | - Kun-Ho Seo
- KU center for One Health, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea
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Jo Y, Oh HM, Yoon Y, Lee SY, Ha JH, Kim WI, Kim HY, Han S, Kim SR. Enrichment Broth for the Detection of Campylobacter jejuni and Campylobacter coli in Fresh Produce and Poultry. J Food Prot 2017; 80:1842-1850. [PMID: 28990821 DOI: 10.4315/0362-028x.jfp-16-450] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 04/12/2017] [Indexed: 11/11/2022]
Abstract
Although campylobacteriosis caused by Campylobacter jejuni and Campylobacter coli has been increasingly reported worldwide owing to the consumption of contaminated poultry and fresh produce, the current detection protocols are not selective enough to inhibit unspecific microbes other than these pathogens. Five antibiotics were separately added to Bolton broth, and the survival rates of 18 Campylobacter spp. and 79 non-Campylobacter spp. were evaluated. The survival rate of the non-Campylobacter spp. was the lowest in Bolton broth with rifampin (6.3%), followed by cefsulodin (12.7%), novobiocin (16.5%), and potassium tellurite and sulfamethozaxole (both 17.7%). Also the most effective concentration of rifampin was found to be 12.5 mg/L, which markedly inhibited non-Campylobacter strains while not affecting the survival of Campylobacter strains. After the Campylobacter spp. were enriched in Bolton broth supplemented with 12.5 mg/L rifampin (R-Bolton broth), CampyFood Agar (CFA) was found to be better in selectively isolating the pathogens in the enrichment broth than the International Organization for Standardization method of using modified charcoal cefoperazone deoxycholate agar (mCCDA) for this step. When applied to natural food samples-here, romaine lettuce, pepper, cherry tomato, Korean leek, and chicken-the R-Bolton broth-CFA combination decreased the number of false-positive results by 50.0, 4.2, 20.8, 50.0, and 94.4%, respectively, compared with the International Organization for Standardization method (Bolton broth-mCCDA combination). These results demonstrate that the combination of R-Bolton broth and CFA is more efficient in detecting C. jejuni and C. coli in poultry and fresh produce and thus should replace the Bolton broth-mCCDA combination.
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Affiliation(s)
- Youmi Jo
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.,Present address: Agromaterial Assessment Division, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Hye-Min Oh
- Department of Food and Nutrition, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Yohan Yoon
- Department of Food and Nutrition, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Sun-Young Lee
- Department of Food Science and Technology, Chung-Ang University, Anseong 47262, Republic of Korea
| | - Ji-Hyoung Ha
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.,Present address: Hygienic Safety and Analysis Center, World Institute of Kimchi, Gwangju 61755, Republic of Korea
| | - Won-Il Kim
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Hwang-Yong Kim
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Sanghyun Han
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Se-Ri Kim
- Microbial Safety Team, Department of Agro-Food Safety & Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
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Chon JW, Kim YJ, Kim YJ, Jung JY, Bae D, Khan S, Seo KH, Sung K. Addition of Rifampicin to Bolton Broth to Inhibit Extended-Spectrum β-Lactamase-ProducingEscherichia colifor the Detection ofCampylobacter. J Food Sci 2017. [DOI: 10.1111/1750-3841.13761] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jung-Whan Chon
- Div. of Microbiology, Natl. Center for Toxicological Research; US Food and Drug Administration; Jefferson AR 72079 U.S.A
| | - Young-Ji Kim
- KU Center for One Health, College of Veterinary Medicine; Konkuk Univ.; Hwayang-dong Gwangjin-gu Seoul 05029 Republic of Korea
| | - Young-Jo Kim
- Ministry of Food and Drug Safety; Osong 28159 Republic of Korea
| | - Ji Young Jung
- Div. of Microbiology, Natl. Center for Toxicological Research; US Food and Drug Administration; Jefferson AR 72079 U.S.A
| | - Dongryeoul Bae
- Div. of Microbiology, Natl. Center for Toxicological Research; US Food and Drug Administration; Jefferson AR 72079 U.S.A
| | - Saeed Khan
- Div. of Microbiology, Natl. Center for Toxicological Research; US Food and Drug Administration; Jefferson AR 72079 U.S.A
| | - Kun-Ho Seo
- KU Center for One Health, College of Veterinary Medicine; Konkuk Univ.; Hwayang-dong Gwangjin-gu Seoul 05029 Republic of Korea
| | - Kidon Sung
- Div. of Microbiology, Natl. Center for Toxicological Research; US Food and Drug Administration; Jefferson AR 72079 U.S.A
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Kim YJ, Whan CJ, Kim HS, Kim KY, Yim JH, Cho SH, Seo KH. Improvement of Karmali Agar by Supplementation with Tazobactam for Detecting Campylobacter in Raw Poultry. J Food Prot 2016; 79:1982-1985. [PMID: 28221899 DOI: 10.4315/0362-028x.jfp-16-105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this study, Karmali agar was modified by adding tazobactam (T-Karmali agar) to suppress the growth of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli , which frequently contaminates raw poultry meat. By inoculating 30 Campylobacter spp. strains and 25 ESBL-producing E. coli strains onto Karmali agar and T-Karmali agar containing various concentrations of the antibacterial agent, we determined the optimum concentration of tazobactam to be 4 mg/liter. The Campylobacter spp. isolation rate on T-Karmali agar (13.3%) was higher than that on Karmali agar (8.3%), although the difference was not significant (P > 0.05). However, T-Karmali agar showed a significantly greater selectivity than Karmali agar, as evaluated by comparing the numbers of contaminated agar plates (20.8 versus 82.5%; P < 0.05) and the growth indexes (1.36 versus 2.83) of competing flora. The predominant competing flora on Karmali and T-Karmali agar were identified as ESBL-producing E. coli . Thus, T-Karmali agar might be effective for determining the real prevalence of Campylobacter in raw poultry and, especially, contamination with ESBL-producing E. coli .
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Affiliation(s)
- Young-Ji Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
| | - Chon-Jung Whan
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
| | - Hong-Seok Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
| | - Kwang-Yeop Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
| | - Jin-Hyeok Yim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
| | - Seung-Hak Cho
- Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health, Heungdeok-Gu, Cheongju 363-951, South Korea
| | - Kun-Ho Seo
- Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul 143-701, South Korea
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Comparative performance of isolation methods using Preston broth, Bolton broth and their modifications for the detection of Campylobacter spp. from naturally contaminated fresh and frozen raw poultry meat. Int J Food Microbiol 2016; 234:60-64. [PMID: 27391222 DOI: 10.1016/j.ijfoodmicro.2016.06.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 06/27/2016] [Accepted: 06/28/2016] [Indexed: 12/26/2022]
Abstract
The performance of different isolation methods was evaluated for the detection of Campylobacter from naturally contaminated raw poultry meat. Therefore, fresh and frozen poultry meat samples were analysed using the standard procedure (ISO 10272-1:2006), enrichment in Preston broth, and enrichment in modified Bolton broth (supplemented with (i) potassium clavulanate (C-BB), (ii) triclosan (T-BB), (iii) polymyxin B (P-BB)). The enrichment cultures were streaked onto both modified charcoal cefoperazone deoxycholate agar (mCCDA) and RAPID'Campylobacter agar (RCA). Moreover, direct plating on mCCDA and RCA was performed to quantify Campylobacter. In total, 33 out of 59 fresh retail meat samples (55.9%) were Campylobacter positive. For both fresh and frozen poultry meat samples, enrichment in Bolton broth (ISO 10272-1:2006) resulted in a higher number of positive samples than enrichment in Preston broth. Supplementation of Bolton broth with potassium clavulanate (C-BB) and triclosan (T-BB) enhanced the Campylobacter recovery from fresh poultry meat compared to non-supplemented Bolton broth, although the use of C-BB was less applicable than T-BB for Campylobacter recovery from frozen samples. Additionally, the use of RCA resulted in a higher isolation rate compared to mCCDA. The present study demonstrates the impact of culture medium on the recovery of Campylobacter from fresh and frozen naturally contaminated poultry meat samples and can support laboratories in choosing the most appropriate culturing method to detect Campylobacter.
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Chon JW, Kim YJ, Kim HS, Kim DH, Kim H, Song KY, Sung K, Seo KH. Evaluation of cephamycins as supplements to selective agar for detecting Campylobacter spp. in chicken carcass rinses. Int J Food Microbiol 2016; 223:75-8. [PMID: 26915052 DOI: 10.1016/j.ijfoodmicro.2016.01.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 11/30/2015] [Accepted: 01/25/2016] [Indexed: 11/17/2022]
Abstract
Although cefoperazone is the most commonly used antibiotic in Campylobacter-selective media, the distribution of cefoperazone-resistant bacteria such as extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli is increasing. Here we evaluated the potential of cephamycins for use as supplements to improve modified charcoal-cefoperazone-deoxycholate agar (mCCDA) by replacing cefoperazone with the same concentrations (32 mg/L) of cefotetan (modified charcoal-cefotetan-deoxycholate agar, mCCtDA) and cefoxitin (modified charcoal-cefoxitin-deoxycholate agar, mCCxDA). In chicken carcass rinse samples, the number of mCCDA plates detecting for Campylobacter (18/70, 26%) was significantly lower than that of mCCtDA (42/70, 60%) or mCCxDA plates (40/70, 57%). The number of mCCDA plates (70/70, 100%) that were contaminated with non-Campylobacter species was significantly higher than that of mCCtDA (20/70, 29%) or mCCxDA plates (21/70, 30%). The most common competing species identified using mCCDA was ESBL-producing E. coli, while Pseudomonas species frequently appeared on mCCtDA and mCCxDA.
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Affiliation(s)
- Jung-Whan Chon
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
| | - Young-Ji Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hong-Seok Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Dong-Hyeon Kim
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hyunsook Kim
- Department of Food & Nutrition College of Human Ecology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Kwang-Young Song
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Kidon Sung
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
| | - Kun-Ho Seo
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea.
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