خيارات البحث
النتائج 1 - 10 من 83
Antimicrobial resistance and transfer of R plasmid of pathogenic Escherichia coli isolated from poultry in Korea
2008
Sung, M.S. (Kyungpook National University, Daegu, Republic of Korea) | Kim, J.H. (Kyungpook National University, Daegu, Republic of Korea) | Cho, J.K. (Health and Environmental Research Institute, Daegu, Republic of Korea) | Seol, S.Y. (Kyungpook National University School of Medicine, Daegu, Republic of Korea) | Kim, K.S. (Kyungpook National University, Daegu, Republic of Korea), E-mail: kimkiseuk@knu.ac.kr
Antimicrobial drugs are widely used in poultry industry as growth promoters or to control infectious diseases. However, this practice is reported to have caused high resistance to antimicrobial drugs in normal chicken flora and pathogens. Antimicrobial resistance to Escherichia coli (E. coli) from chicken has been mainly reported in normal flora, but rare in pathogenic organism in Korea, recently. Therefore, this study was conducted to investigate prevalence of antimicrobials resistance, transfer of R plasmid, and association between antimicrobial drug resistance and O serotype of 203 pathogenic E. coli from poultry in Korea during the period from April 2003 to December 2005. These isolate showed a high resistance to tetracycline (Tc, 92.6%), streptomycin (Sm. 81.8%), ampicillin (Ap, 77.3%), ciprofloxacin (Ci, 70.9%), sulfisoxazole (Su, 66.5%), and trimethoprim (Tp, 58.1%). Two hundred-one (99.0%) of the isolates were resistant to one or more drugs. They showed 57 different resistant patterns, and the most prevalent resistant pattern among them was Tc, Sm, Su, Ap, Tp, Ci, Na. Sixty-eight (33.8%) of the isolates transferred all or a part of their antimicrobial resistant pattern to the recipient strain by R plasmid. The most common antinicrobial resistant pattern was Tc, Sm, Su, Ap, Tp, Ci, Na in serotype O78, O88 and O15, respectively. These results exhibit high individual and multiple resistance to antimicrobials of pathogenic E. coli from poultry in Korea. They also suggest the needs for surveillance to monitor antimicrobial resistance in pathogenic bacteria that can be potentially transmitted to humans from food animals and to regulate the abuse of antimicrobials in food-producing animals in Korea.
اظهر المزيد [+] اقل [-]Descriptive epidemiology of nationwide spread of 2003 classical swine fever epidemic in Korea
2006
Park, C.K. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea), E-mail: parkck@nvrqs.go.kr | Lee, E.S. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Yoon, H.C. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Wee, S.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Song, J.Y. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Moon, O.K. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Choi, E.J. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Kim, H.S. (Chungnam National University, Daejeon, Republic of Korea) | Lee, J.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | An, S.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea)
In March 2003, classical swine fever (CSF) infection was reported in a piggery located at Iksan city, Jeollabuk-do in Korea. Subsequently, a total of 72 infected farms were confirmed between March and December, 2003. Based on epidemiological investigation of the earlier confirmed infected farms, the source of infection was shown to be from a breeding farm. Targeted surveillance of 82 piggeries that had acquired pigs from this breeding farm showed 44 piggeries were infected with CSF virus.
اظهر المزيد [+] اقل [-]Survey of extended-spectrum β-lactamase (ESBL) in pathogenic Escherichia coli isolated from poultry in Korea
2008
Sung, M.S. (Kyungpook National University, Daegu, Republic of Korea) | Kim, J.H. (Kyungpook National University, Daegu, Republic of Korea) | Cho, J.K. (Health and Environmental Research Institute, Daegu, Republic of Korea) | Seol, S.Y. (Kyungpook National University School of Medicine, Daegu, Republic of Korea) | Kim, K.S. (Kyungpook National University, Daegu, Republic of Korea), E-mail: kimkiseuk@knu.ac.kr
This study was conducted to investigate incidence of extended-spectrum β-lactamase (ESBL) producing strains and characteristics of ESBL gene in pathogenic Escherichia coli isolated from poultry during the period from April 2003 to December 2005 in Korea. Among 203 isolates, 4 isolates (3 from broilers and 1 from layer) were confirmed as ESBL producing strains by double disk synergy test, polymerase chain reaction and sequencing for β-lactamase genes. bla∧CTX-M-15 and bla∧CMY-2 were detected in these 4 isolates and were transferred to recipient by conjugation, respectively. Also, these ESBL producing strains were associated with multiple drug resistance. In conclusion, these results exhibit incidence of CTX-M and CMY-2 β-lactamase in pathogenic E coli from poultry in Korea, and clinically important meaning in human. And they also suggest the needs for rapid and broad surveillance to monitor ESBL genes and R plasmid transferring resistant gene in poultry.
اظهر المزيد [+] اقل [-]Occurrence of Pseudomonas aerusinosa infection in the broilers in Korea
2005
Joh, S.J. (National Veterinary Research and Quarantine Service, MAF, Anyang, Republic of Korea) | Kim, M.C. (National Veterinary Research and Quarantine Service, MAF, Anyang, Republic of Korea) | Kwon, Y.K. (National Veterinary Research and Quarantine Service, MAF, Anyang, Republic of Korea), E-mail: kwonyk@nvrqs.go.kr | Kim, J.H. (National Veterinary Research and Quarantine Service, MAF, Anyang, Republic of Korea)
Pseudomonas aerusinosa infection was diagnosed in broiler chicks, and was submitted to the National Veterinary Research and Quarantine Service in Korea. The total mortality rate was about 1,500 birds out of 22,000 broilers. Clinically, affected birds showed clinical signs including depression and anorexia with lameness and trembling of the leg. At necropsy, the dead broilers appeared to have omphalitis, yolk sac infection, fibrinous epicarditis, and fibrinous exudates in liver with swollen hock joint. Microscopically, there were multiple necrotic foci in the liver, fibrinous exudates in the heart, and infiltration of heterophils into the joint spaces of the hock joint.
اظهر المزيد [+] اقل [-]Peripheral lymphocyte counts in Holstein-Friesian cattle infected with bovine leukemia virus in Korea
2005
Suh, G.H. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea), E-mail: ghsuh@rda.go.kr | Lee, C.G. (Chonnam National University, Gwangju, Republic of Korea) | Lee, J.C. (Seojeong College, Yangju, Republic of Korea) | Hur, T.Y. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Kang, S.J. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Son, D.S. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Ahn, B.S. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Kim, N.C. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Lee, C.Y. (Chonnam National University, Gwangju, Republic of Korea)
Hematologic investigations were made on the blood samples taken from bovine leukemia virus (BLV)-seropositive Holstein-Friesian cattle in Korea, and their absolute lymphocyte count was compared with that of BLV-seronegative cattle. The incidence of persistent lymphocytosis (PL) was also determined. The normal bovine lymphocyte count was established on the basis of studies of 656 blood samples taken three times from 297 seronegative animals aged from 0~6 months to over 5 years at 5~6-month intervals. The data were examined according to 7 age groups of samples placed into their respective age groups.
اظهر المزيد [+] اقل [-]Sero-prevalence of swine influenza virus (H1N1, H3N2) In Korea
2007
Yoon, J.S. (Kangwon National University, Chuncheon, Republic of Korea) | Park, B.K. (Seoul National University, Seoul, Republic of Korea) | Han, J.H. (Kangwon National University, Chuncheon, Republic of Korea), E-mail: hanjh@kangwon.ac.kr
Swine influenza is an acute, infectious respiratory disease caused by type A influenza viruses in pigs. In the previous studies, serological surveys have indicated the presence of H3N2 swine influenza virus (SIV) since 1995 in Korea. And the percentage of the antibody-positive rate was 39.12% in the survey determining the prevalence of H1N1 SIV antibodies in 2002. The purpose of this study was therefore to investigate the sero-prevalence of SIV regard to the age of the pig and the season between June 2004 and May 2005. In this study, a total of 932 sera were used.
اظهر المزيد [+] اقل [-]Studies on the udder characteristics of Korean Holstein cows
Lee, J.C.(Seojeong College, Yangju, Republic of Korea) | Lee, C.G.;Lee, C.Y.(Chonnam National University, Gwangju, Republic of Korea)E-mail:cylee@chonnam.ac.kr
This study was conducted to analyze the relationship between the occurrence of mastitis and the conformation of udders, teats, and teat tips of Holstein cows raised in Korea. Udders, teats, and teat tips were categorized by their conformation and the teat length, teat diameter and the distance from the tip of teat to the ground of 259 cows were measured. The most common shapes of udder, teats and teat tip were milking machine udder (27.4%), U-shaped teats (53.9%) and disk teat tip (53.8%), respectively.
اظهر المزيد [+] اقل [-]Identification of risk factors associated with the incidence of canine distemper in Korea
Yoon, H.C.;Park, C.K.;Wee, S.H.(National Veterinary Research and Quarantine Service, Anyang, Republic of Korea)E-mail:wsh@nvrqs.go.kr | Kim, T.J.;Lee, J.B.(Konkuk University, Seoul, Republic of Korea) | Kim, E.O.;Lee, J.K.;Kim, S.D.(Neodin VetLab, Seoul, Republic of Korea)
To identify risk factors of canine distemper, which is one of the most important disease of dogs in Korea, a case-control study was performed with 2,507 cases and 4,121 controls from 630 veterinary clinics throughout Korea. In multivariate logistic regression models, the sampling period (Mars and April) and the age of the dogs (7-12 months old) were associated with an increased risk of canine distemper. Sex, body size and residential region showed no significant relationship.
اظهر المزيد [+] اقل [-]Serologic and electropherotypic characterization of the bovine rotaviruses isolated in Korea
1998
Chung, C.W. | Chang, C.H. | Cho, J.C. | An, S.H. (National Veterinary Research Institute, RDA, Anyang (Korea Republic)) | Kang, S.Y. (Chungbuk National University, Chongju (Korea Republic). College of Veterinary Medicine) | Park, B.K. (Seoul National University, Suwon (Korea Republic). College of Veterinary Medicine)
Sero-epidemiology of the major swine infectious disease in Cheju
1997
Lyoo, Y.S. | Park, C.K. | Kim, L.M. | Lee, C.H. | Choi, S.H. (National Veterinary Research Institute, RDA, Anyang (Korea Republic)) | Kim, S.I. | Bae, J.H. (Cheju National University, Cheju (Korea Republic). Department of Veterinary Medicine)