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Antimicrobial Resistance Profiles and Characterization of Escherichia coli Strains from Cases of Neonatal Diarrhea in Spanish Pig Farms. Vet Sci 2020; 7:vetsci7020048. [PMID: 32326282 PMCID: PMC7357114 DOI: 10.3390/vetsci7020048] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/14/2020] [Accepted: 04/17/2020] [Indexed: 02/07/2023] Open
Abstract
Escherichia coli is considered one of the most common agents associated with neonatal diarrhea in piglets. The aim of this work was to characterize the pathogenic and antimicrobial resistance (AMR) profiles of 122 E. coli strains isolated from pigs suffering diarrhea (n = 94) and pigs without diarrhea (n = 28) of 24 farms in Spain. Virulence factors, toxins and AMR (ESBL and colistin) genes and AMR phenotypes of E. coli isolates were analyzed. Low prevalence of pathogenic E. coli strains (26%) was found in both groups. However, ETEC and VTEC strains were more frequently isolated from diarrheic piglets. Irrespectively of diarrhea occurrence, 97.5% of the strains showed a multidrug-resistance (MDR) profile to aminopenicillins, sulfonamides and tetracyclines. It was found that 22% of E. coli was CTX-M+, with CTX-M-14 being the principal allelic variant. Remarkably, 81.5% of CTX-M+ strains were isolated from diarrheic animals and presented an extended MDR profile to aminopenicillins, quinolones and aminoglycosides. Finally, low frequencies of colistin resistance genes mcr-1 (4/122) and mcr-4 (1/122) were found. MDR E. coli strains are circulating in pig farms of Spain, representing a serious threat to animal and public health. More appropriate diagnostic approaches (genetic and AMR phenotypic analysis) should be implemented in animal health to optimize antibiotic treatments.
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G M Gonzalez A, M F Cerqueira A. Shiga toxin-producing Escherichia coli in the animal reservoir and food in Brazil. J Appl Microbiol 2019; 128:1568-1582. [PMID: 31650661 DOI: 10.1111/jam.14500] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 09/18/2019] [Accepted: 10/22/2019] [Indexed: 12/11/2022]
Abstract
Shiga toxin-producing Escherichia coli (STEC) is a zoonotic pathotype associated with human gastrointestinal disease that may progress to severe complications. Ruminants, especially cattle, are the main reservoirs of STEC contaminating the environment and foods of animal or vegetable origin. Besides Shiga toxin, other virulence factors are involved in STEC virulence. O157:H7 remains the most frequent serotype associated with disease. In Brazil, the prevalence of STEC reaches values as high as 90% in cattle and 20% in meat products which may impact the Brazilian food export trade. However, only few reports are related to human disease. The stx1 gene prevails in cattle, whereas the stx2 gene is more frequent in food. Several STEC serotypes have been isolated from cattle and food in Brazil, including the O157:H7, O111:NT, NT:H19 as well as O26 and O103 serogroups. O113: H21 STEC strains are frequent in ruminants and foods but with no report in human disease. The virulence profile of Brazilian STEC strains from cattle and food suggests a pathogenic potential to humans, although some differences with clinical strains have been detected. Further studies, employing recent and more discriminative techniques are in need to better clarify their virulence potential.
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Affiliation(s)
- Alice G M Gonzalez
- Departamento de Bromatologia, Universidade Federal Fluminense, Niterói, Brazil
| | - Aloysio M F Cerqueira
- Departamento de Microbiologia e Parasitologia, Universidade Federal Fluminense, Niterói, Brazil
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Fasina FO, Bwala DG, Madoroba E. Investigation of multidrug-resistant fatal colisepticaemia in weanling pigs. Onderstepoort J Vet Res 2015; 82:986. [PMID: 26842367 PMCID: PMC6238774 DOI: 10.4102/ojvr.v82i1.986] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 08/21/2015] [Accepted: 08/27/2015] [Indexed: 02/05/2023] Open
Abstract
Escherichia coli is usually a benign commensal of the gut microflora. However, when E. coli acquires virulence genes it can multiply rapidly and cause disease through colonisation of the intestinal mucosa. Escherichia coli can become a significant pathogen in young pigs. We report an investigation of fatal colisepticaemia in weanling pigs from emerging farms where piglets and weaners were diarrhoeic and the mortality rate ranged between 15% and 70% in each litter. Faecal and tissue samples were processed for histopathology, bacteriology and molecular biology (multiplex and monoplex polymerase chain reaction) and we recovered enteroaggregative multidrug-resistant E. coli producing EAST-1 enterotoxin. An association between poor housing conditions and the observed cases was established and future management programmes were recommended to reduce the impact of such pathogens. Enteroaggregative E. coli is becoming a major problem in the pig industry. It therefore becomes necessary to establish the full impact of E. coli on the South African pig industry and to determine the geographic extent of the problem.
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Vidotto MC, Florian ECT, Ono MA. Prevalence of the paa gene (porcine attaching and effacing associated) in porcine enteropathogenic Escherichia coli (PEPEC) associated with postweaning diarrhea in south Brazil. Braz J Microbiol 2013; 44:515-7. [PMID: 24294249 PMCID: PMC3833155 DOI: 10.1590/s1517-83822013000200030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 07/23/2012] [Indexed: 11/22/2022] Open
Abstract
Paa (porcine attaching and effacing associated) may be an important virulence factor E. coli of piglets with diarrhea. This study showed for the first time in Brazil the prevalence of the paa gene (22%) in E. coli strains isolated from piglets and these isolates also harboured genes for other adhesins and toxins LT II, STa and STb.
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Affiliation(s)
- Marilda C Vidotto
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina, Londrina, PR, Brazil
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A novel watery diarrhoea caused by the co-infection of neonatal piglets with Clostridium perfringens type A and Escherichia coli (K88, 987P). Vet J 2013; 197:812-6. [DOI: 10.1016/j.tvjl.2013.05.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 03/09/2013] [Accepted: 05/06/2013] [Indexed: 11/17/2022]
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Cruz Junior EC, Salvarani FM, Silva RO, Silva MX, Lobato FC, Guedes RM. A surveillance of enteropathogens in piglets from birth to seven days of age in Brazil. PESQUISA VETERINARIA BRASILEIRA 2013. [DOI: 10.1590/s0100-736x2013000800002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The purpose of the study was to evaluate the real importance of anaerobic enteropathogens and rotavirus in contrast to more common agents as cause of diarrhea in piglets within the first week of life. Sixty 1- to 7-day-old piglets, 30 diarrheic and 30 non-diarrheic (control), from 15 different herds were selected, euthanized and necropsied. Samples of the jejunum, ileum, colon, cecum and feces were collected from the piglets and analyzed to determine the presence of the following enteropathogens: enterotoxigenic Escherichia coli (ETEC), Clostridium perfringens types A and C, Clostridium difficile, rotavirus and Isospora suis. Among diarrheic piglets, 23.3% were positive for C. difficile, 70% for C. perfringens type A cpb2+, 14.3% for rotavirus and 10% for ETEC. Among non-diarrheic control piglets, 10% were positive for C. difficile, 76.7% for C. perfringens type A cpb2+, 0% for rotavirus, 3.3% for ETEC and 3.3% for I. suis. C. perfringens type C was not detected in any of the animals. Histological lesions characteristic of C. difficile, E. coli and rotavirus were observed. However, no C. perfringens type A suggestive lesions were detected. There was a positive correlation between mesocolon edema and the presence of C. difficile toxins. Although C. perfringens type A cpb2+ was the most frequently detected enteropathogen, there was no association between its presence and diarrhea or macro or microscopic changes. C. difficile and Rotavirus were the most relevant pathogens involved with neonatal diarrhea in this study, and histopathology associated with microbiological test proved to be the key to reach a final diagnosis.
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Hur J, Lee K, Lee J. Age-dependent competition of porcine enterotoxigenic E. coli (ETEC) with different fimbria genes - short communication. Acta Vet Hung 2011; 59:411-7. [PMID: 22079701 DOI: 10.1556/avet.2011.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To investigate the association of pathogenic Escherichia coli fimbrial adhesins with the development of diarrhoea in piglets of different age groups and to test their relative competitiveness, piglets were orally inoculated with a mixture of E. coli strains harbouring F4, F5, F6, F18 and F41 fimbrial genes. A total of 537 E. coli strains with haemolytic activity were isolated from 36 diarrhoeic piglets. The F4 fimbrial gene was observed in 98.5%, 97.6% and 80.6% strains carrying fimbrial genes isolated from diarrhoeic piglets that were infected at 1, 3 and 5 weeks of age, respectively. These data demonstrate that F4 fimbriae are highly associated with diarrhoea in piglets of all age groups. Interestingly, the F18 fimbrial gene was observed in 2.4% and 25.4% strains carrying fimbrial genes isolated from the 3- and 5-week-old groups, respectively, which confirms that F18 fimbriae are associated with diarrhoea in piglets from late stages of suckling to post-weaning, and are more related to diarrhoea in weaned than in unweaned piglets.
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Affiliation(s)
- Jin Hur
- 1 Chonbuk National University Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute Jeonju 561-756 Republic of Korea
| | - Kyeong Lee
- 1 Chonbuk National University Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute Jeonju 561-756 Republic of Korea
| | - John Lee
- 1 Chonbuk National University Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute Jeonju 561-756 Republic of Korea
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Wang XM, Liao XP, Liu SG, Zhang WJ, Jiang HX, Zhang MJ, Zhu HQ, Sun Y, Sun J, Li AX, Liu YH. Serotypes, Virulence Genes, and Antimicrobial Susceptibility ofEscherichia coliIsolates from Pigs. Foodborne Pathog Dis 2011; 8:687-92. [DOI: 10.1089/fpd.2010.0739] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xiu-Mei Wang
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xiao-Ping Liao
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Si-Guo Liu
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Wan-Jiang Zhang
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Hong-Xia Jiang
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Mei-Jun Zhang
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Heng-Qian Zhu
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ying Sun
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jian Sun
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ai-Xin Li
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ya-Hong Liu
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
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Vidotto MC, de Lima NCS, Fritzen JTT, de Freitas JC, Venâncio MJ, Ono MA. Frequency of virulence genes in Escherichia coli strains isolated from piglets with diarrhea in the North Parana State, Brazil. Braz J Microbiol 2009; 40:199-204. [PMID: 24031344 PMCID: PMC3768501 DOI: 10.1590/s1517-838220090001000035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Revised: 05/09/2008] [Accepted: 02/25/2009] [Indexed: 11/23/2022] Open
Abstract
Identification of Escherichia coli causing porcine postweaning diarrhea requires knowledge regarding the prevalent pathotypes within a given region. A total of 100 Escherichia coli isolates from piglets with diarrhea in Londrina city, Parana State, South Brazil, were screened for the presence of genes for F4, F5, F6, F18, F41 fimbrial antigens by specific probes and for enterotoxins (STa, STb, LT and STx2e) by polymerase chain reaction (PCR). The results showed that 60% of the isolates were positive for one or more of the fimbrial antigens and 92% were positive at least for one of the virulence factors examined. Virulence factor genes detected were F4 (44%), F18 (38%), F5 (30%), F41 (32%), F6 (25%), LTp-I (71%), STa (40%), STb (47%) and STx2e (3%). Twenty four patterns of virulence factor according to the different virulence genes form were found and the most frequent virulence gene pattern was F4, F18, F41, STa, STb and LT. Most of the isolates that carried genes for adhesins also harboured genes for toxins.
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Affiliation(s)
- Marilda C Vidotto
- Universidade Estadual de Londrina, Departamento de Medicina Veterinária Preventiva , Londrina, PR , Brasil
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Menin Á, Reck C, Wolff C, Bierhals T, Costa U, Klein C, Vaz E. FENOTIPIA E CONCENTRAÇÃO INIBITÓRIA MÍNIMA (CIM) EM LINHAGENS DE ESCHERICHIA COLI ISOLADAS DE LEITÕES COM DIARRÉIA NAS FASES DE MATERNIDADE, CRECHE, CRESCIMENTO E TERMINAÇÃO. ARQUIVOS DO INSTITUTO BIOLÓGICO 2008. [DOI: 10.1590/1808-1657v75p2552008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
RESUMO Escherichia coli é reconhecida como causa freqüente de diarréia em suínos em todo o mundo. O objetivo do presente estudo foi caracterizar fenotipicamente os tipos fimbriais de 349 linhagens de E. coli isoladas de suínos com diarréia, em diferentes faixas etárias, utilizando os testes de microhemaglutinação e soroaglutinação, bem como determinar o perfil de suscetibilidade frente aos principais antimicrobianos utilizados em granjas de suínos. Do total de 159 linhagens de E. coli que não aglutinaram eritrócitos no teste de hemaglutinação manose-resistente (HAMR), 57 (35%) foram positivas para a expressão do antígeno fimbrial F6 no teste de soroaglutinação rápida em placa. Considerando a faixa etária e o fenótipo fimbrial, os sorotipos de E. coli, potencialmente patogênicos mais prevalentes até a terceira semana de idade, foram F5 (K99), F6 (987P), F42 e F41 em, respectivamente, 29%, 23%, 11% e 10% das linhagens. Em leitões com mais de 25 dias, predominaram fimbrias F4 (K88) em 44,6% (58) das linhagens. Os animais foram suscetíveis às cepas contendo F4, durante todas as faixas etárias, mas com maior predominância em idades mais avançadas, acima de 76 dias. Os maiores índices de resistência das linhagens foram observados para oxitetraciclina (84,0%), gentamicina (76,0 %) e amoxicilina (72,0%). Os menores valores de Concentração Inibitória Mínima (CIM) 50 e 90 foram observados para o ceftiofur.
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Affiliation(s)
- Á Menin
- Universidade do Estado de Santa Catarina, Brasil
| | - C. Reck
- Instituto Catarinense de Sanidade Animal, Brasil
| | - C. Wolff
- Universidade do Estado de Santa Catarina, Brasil
| | - T. Bierhals
- Universidade do Estado de Santa Catarina, Brasil
| | - U.M. Costa
- Universidade do Estado de Santa Catarina, Brasil
| | | | - E.K. Vaz
- Universidade do Estado de Santa Catarina, Brasil
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Vu-Khac H, Holoda E, Pilipcinec E, Blanco M, Blanco JE, Dahbi G, Mora A, López C, González EA, Blanco J. Serotypes, virulence genes, intimin types and PFGE profiles of Escherichia coli isolated from piglets with diarrhoea in Slovakia. Vet J 2007; 174:176-87. [PMID: 16956777 DOI: 10.1016/j.tvjl.2006.05.019] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2005] [Revised: 04/04/2006] [Accepted: 05/25/2006] [Indexed: 11/20/2022]
Abstract
Two hundred and fifty Escherichia coli isolates from diarrhoeic and healthy piglets were serotyped and tested for the presence of virulence genes for fimbriae, intimin, heat-labile (LT) and heat-stable (STa and STb) enterotoxins, Stx toxins, and enteroaggregative heat-stable 1 (EAST1) enterotoxin by polymerase chain reaction (PCR). Although 220 isolates from diarrhoeic piglets belonged to 43 O serogroups and 77 O:H serotypes, 60% were of one of the 10 serogroups O2, O8, O15, O54, O84, O101, O141, O147, O149 and O157, and 60% belonged to only 10 serotypes (O8:H-, O54:H-, O84:H7, O101:H-, O141:H-, O141:H4, O147:H-, O149:H10, O163:H-, and ONT:H-). PCR showed that 79% of 220 isolates carried genes for at least one of the virulence factors tested. The gene encoding for EAST1 was the most prevalent (65%) followed by those encoding for STb (49%), LT (42%), STa (13%), and Stx2e (4%). Eighty-three (38%) of the 220 E. coli isolates carried the gene for F4 (K88), whereas genes for F18, F5 (K99), F41, F6 (P987), F17, and intimin (eae) were detected in 9%, 3%, 3%, 3%, 1%, and 3%, respectively. Seropathotype O149:H10:F4:LT/STb/EAST1 (70 isolates) was the most common, representing 32% of isolates. Pulsed-field gel electrophoresis (PFGE) analysis with XbaI of 15 O149:H10 representative isolates from diarrhoeic piglets distinguished 14 types. The 15 isolates exhibited a wide variability of distinct restriction patterns though all belonged to the same serotype (O149:H10), and all but one showed identical virulence determinants (F4, LT, STb, and EAST1). Among 30 isolates from healthy piglets only two virulence genes were detected: EAST1 (26%) and eae (17%). In total, 12 isolates were positives for the eae gene: five isolates had intimin beta1, four possessed intimin theta and three showed intimin type xiB. This is believed to be the first study describing the presence of intimin type xiB in E. coli of porcine origin.
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Affiliation(s)
- H Vu-Khac
- Institute of Microbiology and Immunology, Department of Food Hygiene and Technology, University of Veterinary Medicine, Komenskeho 73, Slovakia
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Costa MMD, Silva MSE, Spricigo DA, Witt NM, Marchioro SB, Kolling L, Vargas APCD. Caracterização epidemiológica, molecular e perfil de resistência aos antimicrobianos de Escherichia coli isoladas de criatórios suínos do sul do Brasil. PESQUISA VETERINARIA BRASILEIRA 2006. [DOI: 10.1590/s0100-736x2006000100002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A colibacilose é a enfermidade entérica de maior impacto na suinocultura, sendo ocasionada por cepas enterotoxigênicas de Escherichia coli. Quarenta isolados clínicos de suínos com diarréia e 13 isolados ambientais foram analisados quanto ao perfil genotípico, relação genética e resistência antimicrobiana. O gene que codifica para a toxina Stb foi identificado em 50% dos isolados clínicos, seguido por Sta e Lt, com 35%. Dentre os fatores de adesinas pesquisados, a F18 foi encontrada em 27,5% das amostras. A técnica de ERIC-PCR utilizada para caracterização epidemiológica dos isolados, não demonstrou poder discriminatório esperado, e apesar de permitir a separação dos isolados em grupos, estes não evidenciaram grupos relacionados aos fatores de virulência. No teste de susceptibilidade antimicrobiana a maior resistência foi observada à tetraciclina, em 88,6%. O índice de resistência múltipla aos antimicrobianos (IRMA), variou entre 0 a 0,69.
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Vu-Khac H, Holoda E, Pilipcinec E. Distribution of virulence genes in Escherichia coli strains isolated from diarrhoeic piglets in the Slovak Republic. ACTA ACUST UNITED AC 2005; 51:343-7. [PMID: 15525362 DOI: 10.1111/j.1439-0450.2004.00769.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Ninety-two Escherichia coli isolates from 14 to 28-day-old piglets that died because of diarrhoea were examined for genes for fimbriae (F4, F5, F6, F18 and F41), enterotoxins (STa, STb and LT), verotoxin (VT2e or Stx2e) and enteroaggregative heat-stable enterotoxin 1 (EAST1) by polymerase chain reaction. Twenty-two strains (24%) carried a gene for F4, whereas genes for F18, F6 and F5 + F41 were detected in 10.8, 3.3 and 1.1% of strains respectively. Genes for STb, LT, STa and Stx2e were detected in 40.2, 26.1, 14.1 and 1.1% of strains respectively. The astA gene was detected in 49 (53.3%) isolates, 35 of which also carried genes for enterotoxins and/or fimbriae. The major genotypes reached at (in decreasing order of prevalence) were F4/STb/LT/EAST1, F18/STa/STb/EAST1, STb/EAST1, F6/STa/STb/EAST1 and F18/STb/EAST1.
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Affiliation(s)
- H Vu-Khac
- Department of Food Hygiene and Technology, Centre for Analysis of DNA, Institute of Microbiology and Immunology, University of Veterinary Medicine, Komenského 73, 041 81, Kosice, The Slovak Republic
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Chen X, Gao S, Jiao X, Liu XF. Prevalence of serogroups and virulence factors of Escherichia coli strains isolated from pigs with postweaning diarrhoea in eastern China. Vet Microbiol 2004; 103:13-20. [PMID: 15381261 DOI: 10.1016/j.vetmic.2004.06.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2003] [Revised: 06/01/2004] [Accepted: 06/05/2004] [Indexed: 10/26/2022]
Abstract
This study was undertaken to determine the present distribution of serogroups, hemolytic activity and virulence factors among Escherichia coli strains isolated from pigs with postweaning diarrhoea from eight provinces in eastern China. Two hundred and fifteen E. coli isolates were serogrouped with O-antisera, investigated for hemolytic activity, assessed for F4, F5, F6, F18 and F41 fimbrial antigens by monoclonal antibodies and detected for genes of enterotoxins and shiga-toxin-two-variant (Stx2e) by a multiplex polymerase chain reaction (PCR). Among these E. coli isolates, 140 were determined to be placed in serogroups, 52 were unable to be serogrouped and the rest 23 auto-agglutinated. These isolates distributed in 45 serogroups and 64.3% (90/140) belonged to 12 O serogroups: O8, O9, O11, O20, O32, O91, O93, O101, O107, O115, O116 and O131. Hemolytic activity was detected in 11.6% (25/215) of all isolates. Several uncommon O serogroups were discovered in this study. Agglutination tests showed that 50.2% (108/215) of these isolates were positive for one or more of the five fimbrial antigens. Seventy-two E. coli strains expressed single fimbria and 36 strains expressed two or more fimbriae. Among these 215 E. coli isolates, strains expressing F18, F4, F6, F6 + F18 or F5 + F41 occurred more frequently. PCR analysis showed that 60.5% (130/215) of the isolates only harboured the gene of estI (STI) while 6.0% (13/215) strains possessed the genes of stx2e, estI and estII and 5.6% (12/215) of strains had the genes of estI/estII. Of all these isolates, 107 (49.8%) were negative for the fimbrial antigens examined. The fimbria-negative isolates usually possessed genetic determinant of estI (78, 72.9%).
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Affiliation(s)
- Xiang Chen
- Animal Infectious Disease Laboratory, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
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Vu-Khac H, Holoda E, Majerciak M, Gaspar G, Pilipcinec E. Genotyping of fimbrial adhesins in Escherichia coli strains isolated from Slovak piglets suffering from diarrhea. Folia Microbiol (Praha) 2004; 49:59-63. [PMID: 15114867 PMCID: PMC7090526 DOI: 10.1007/bf02931647] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2003] [Revised: 09/09/2003] [Indexed: 11/24/2022]
Abstract
One-hundred sixty Escherichia coli isolates obtained from piglets with diarrhea from different parts of Slovakia were examined for the presence of genes coding for F4, F5, F6 and F41 fimbrial adhesins, and hemolytic activity. According to polymerase chain reaction tests 74 (46%) E. coli isolates were positive for primers that detected genes coding for fimbrial adhesins. Of these 74 isolates, 64 were positive for genes encoding for F4+, four for F5+, five for F6+, and one for both F41+ and F5+ adhesins.
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Affiliation(s)
- H Vu-Khac
- Institute of Microbiology and Immunology, Department of Food Hygiene and Technology, University of Veterinary Medicine, 041 81 Kosice, Slovakia
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16
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Wong I, Garcı́a M, Rodrı́guez I, Ramos L, Olivera V. Fermentation scale up for production of antigen K88 expressed in Escherichia coli. Process Biochem 2003. [DOI: 10.1016/s0032-9592(02)00326-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Carvalho VM, Gyles CL, Ziebell K, Ribeiro MA, Catão-Dias JL, Sinhorini IL, Otman J, Keller R, Trabulsi LR, Pestana de Castro AF. Characterization of monkey enteropathogenic Escherichia coli (EPEC) and human typical and atypical EPEC serotype isolates from neotropical nonhuman primates. J Clin Microbiol 2003; 41:1225-34. [PMID: 12624055 PMCID: PMC150271 DOI: 10.1128/jcm.41.3.1225-1234.2003] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2002] [Revised: 09/09/2002] [Accepted: 10/24/2002] [Indexed: 11/20/2022] Open
Abstract
Enteropathogenic Escherichia coli (EPEC) has been associated with infantile diarrhea and mortality in humans in developing countries. While diarrhea is also a major problem among primates kept in captivity, the role of E. coli is unclear. This study was designed to characterize diarrheagenic E. coli recovered from the feces of 56 New World nonhuman primates, primarily marmosets (Callithrix spp.). Seventeen of the 56 primates had signs of diarrhea and/or enteritis. E. coli recovered from feces from these animals was tested by PCR for genes encoding virulence factors of diarrheagenic E. coli and for patterns of adherence to HeLa cells. In addition, isolates were characterized by the fluorescence actin staining test and by their ability to induce attaching and effacing lesions. PCR for the eae gene was positive in 10 of the 39 (27%) apparently healthy animals and in 8 of the 17 (47%) animals with diarrhea and/or enteritis. Colonies of eae(+) E. coli were serotyped and examined by PCR for genes encoding EPEC virulence markers. The eae(+) E. coli isolates recovered from both healthy and sick nonhuman primates demonstrated virulence-associated attributes similar to those of EPEC strains implicated in human disease and are designated monkey EPEC. The results presented here indicate that EPEC may be a significant pathogen for nonhuman primates, deserving further investigation. The similarities between the affected animals investigated in this study and human EPEC infections suggest that marmosets may represent an important model for EPEC in humans.
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Affiliation(s)
- Vania M Carvalho
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, São Paulo, Brazil
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Dias da Silveira W, Ferreira A, Brocchi M, Maria de Hollanda L, Pestana de Castro AF, Tatsumi Yamada A, Lancellotti M. Biological characteristics and pathogenicity of avian Escherichia coli strains. Vet Microbiol 2002; 85:47-53. [PMID: 11792491 DOI: 10.1016/s0378-1135(01)00482-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fifty avian (chicken) pathogenic Escherichia coli strains (APEC) isolated from individuals suffering from omphalitis, septicaemia and swollen head syndrome, and 30 strains isolated from healthy chickens were studied regarding their biological characteristics such as serogroups, haemolysin, colicin, cytotoxin, toxin and siderophore production, adhesion capacity to in vitro cultivated cells, and absorption of Congo red dye. Serotyping demonstrated that most of the omphalitis and normal strains were untypable, whereas most of the septicaemic strains were either untypable or rough. There was no prevalent serogroup among the pathogenic strains studied. The capacity for adhesion and invasion of in vitro cultured cells (HeLa, HEp-2, KPCC), as well as the agglutination of different types of red blood cells and the LD50 of each strain were also evaluated. No correlation was observed between the biological characteristics and pathogenicity, except that colicin was characteristically produced by swollen head syndrome E. coli strains. No correlation was found between adhesion or haemagglutination patterns and pathogenicity. Only six of the 50 strains revealed invasive capacity and the strain that best invaded the cell lines was the one with the lowest LD50.
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Affiliation(s)
- Wanderley Dias da Silveira
- Department of Microbiology and Immunology IB, Biology Institute, State University of Campinas, CP 6109, CEP 13081-970 Campinas, SP Brazil.
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