PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

The aim of the present study was to investigate the presence of Salmonella spp. in samples collected from beef meat at three points of the slaughter line (after skinning, washing and cooling) at three slaughterhouses in Brazil that export meat. Detection was based on ISO 6579:2002 and confirmed by PCR and qPCR. The isolates were typified using slide agglutination tests and PFGE. The antibiotic sensitivity profile was determined using the disk diffusion method. Contamination was detected in only one slaughterhouse. The overall frequency of contamination by Salmonella spp. was 6.7% of carcasses (6/90) and 2.6% of carcass surface samples (7/270). All isolates were confirmed by PCR and qPCR. The serological analysis and the PFGE showed a single profile: Typhimurium. The strains demonstrated 100% susceptibility to ampicillin, cefotaxime, ciprofloxacin, chloramphenicol, gentamicin and tetracycline. Positive carcasses after cooling pose a direct risk to consumers, since the meat is considered ready to be marketed after this process.

• Salmonella spp. beef meat slaughterhouses Brazil serotype antibiotic resistance salmonellosis skinning cooling carcass cattle

Abstract in Portuguese:

O objetivo deste trabalho foi investigar a presença de Salmonella spp. em amostras coletadas de carcaças de bovinos, em três pontos da linha de abate (após a esfola, lavagem e refrigeração) de três frigoríficos exportadores no Brasil. A detecção foi realizada pela ISO 6579:2002, e confirmada por PCR e qPCR. Os isolados foram tipificados por testes de soroaglutinação e PFGE e avaliado o perfil de sensibilidade aos antibióticos pelo método de difusão em disco. A contaminação foi detectada em apenas um abatedouro‑frigorífico. As contaminações das carcaças (n=90) e amostras de carne (n=270) por Salmonella spp. foram 6 (6,7%) e 7 (2,6%), respectivamente. Todos os isolados foram confirmados por PCR e qPCR. A análise sorológica e o PFGE mostraram um único perfil: Typhimurium. As cepas apresentaram 100% de suscetibilidade à ampicilina, cefotaxima, ciprofloxacina, cloranfenicol, gentamicina e tetraciclina. As carcaças positivas após a refrigeração apresentam um risco direto para o consumidor, uma vez que, após este processo, a carne está pronta para ser comercializada.

• Salmonella spp. carcaças bovinas abatedouros-frigoríficos sorotipo resistência a antibióticos salmonelose carne bovina esfola resfriamento bovinos

Abstract in English:

ABSTRACT.- Bronzato G.F., Oliva M.S., Alvin M.G., Pribul B.R., Rodrigues D.P., Coelho S.M.O., Coelho I.S. & Souza M.M.S. 2018. MALDI-TOF MS as a tool for the identification of Vibrio alginolyticus from Perna perna mussels (Linnaeus, 1758). [MALDI-TOF MS como ferramenta na identificação de Vibrio alginolyticus isolados de mexilhões Perna perna (Linnaeus, 1758).] Pesquisa Veterinária Brasileira 38(8):1511-1517. Departamento de Microbiologia e Imunologia Veterinária, Universidade Federal Rural do Rio de Janeiro, BR-465 Km 7, Seropédica, RJ 23897-970, Brazil. E-mail: miliane@ufrrj.br Vibrio species are ubiquitous in aquatic environments, including coastal and marine habitats. Vibrio alginolyticus is an opportunistic pathogen for fish, crustaceans and mussels and their identification by biochemical tests may be impaired due their nutritional requirements. The study used Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) to identify 49 Vibrio spp. isolates associated with mussels (Perna perna) from different locations along the Rio de Janeiro coast. The rpoA gene was used as a genus-specific marker of Vibrio spp. and was positive in all 209 isolates. MALDI-TOF MS confirmed 87.8% of V. alginolyticus when compared to the results of the biochemical tests. Four isolates were identified as Shewanella putrefaciens (8.16%) and one was identified as V. parahaemolyticus (2.0%). Just one isolate was not identified by this technique (2.0%). The pyrH sequencing confirmed 75% of the proteomic technique results. MALDI-TOF MS is an excellent option for characterization of bacterial species, as it is efficient, fast and easy to apply. In addition, our study confirms its high specificity and sensitivity in these marine bacteria identification.

• MALDI-TOF MS mitiliculture Vibrio alginolyticus Perna perna mussels.

Abstract in Portuguese:

RESUMO.- Bronzato G.F., Oliva M.S., Alvin M.G., Pribul B.R., Rodrigues D.P., Coelho S.M.O., Coelho I.S. & Souza M.M.S. 2018. MALDI-TOF MS as a tool for the identification of Vibrio alginolyticus from Perna perna mussels (Linnaeus, 1758). [MALDI-TOF MS como ferramenta na identificação de Vibrio alginolyticus isolados de mexilhões Perna perna (Linnaeus, 1758).] Pesquisa Veterinária Brasileira 38(8):1511-1517. Departamento de Microbiologia e Imunologia Veterinária, Universidade Federal Rural do Rio de Janeiro, BR-465 Km 7, Seropédica, RJ 23897-970, Brazil. E-mail: miliane@ufrrj.br Espécies de Vibrio são ubiquitárias em ambientes aquáticos, incluindo habitats costeiros e marinhos. A espécie Vibrio alginolyticus é oportunista para peixes, crustáceos e moluscos e a sua identificação através de testes bioquímicos pode ter a qualidade prejudicada devido às suas exigências nutricionais. O presente estudo utilizou Espectrometria de Massa por Tempo de Vôo de Ionização/Desorção por Laser Assistida por Matriz (MALDI-TOF MS) para identificar diferentes espécies de Vibrio provenientes de mexilhões (Perna perna) coletados em diferentes locais ao longo da costa do Rio de Janeiro. O gene rpoA foi utilizado como um marcador gênero-específico de Vibrio spp. sendo positivo em todos os 209 isolados. MALDI-TOF MS confirmou 87,75% de V. alginolyticus quando comparados com os resultados dos testes bioquímicos. Quatro isolados foram identificados como Shewanella putrefaciens (8,16%), um como V. parahaemolyticus (2,0%) e apenas um (2,0%) não foi identificado pela técnica proteômica. E o sequenciamento do pyrH confirmou 75% dos resultados da técnica proteomica. MALDI-TOF MS tem sido considerada uma excelente opção para a caracterização bacteriana, por ser eficiente, rápida, de fácil aplicação e este estudo confirmou a sua elevada especificidade e sensibilidade na identificação de bactérias marinhas.

Abstract in English:

The presence of Salmonella spp. in poultry products and their by-products is a major challenge for commercial production. Data about the prevalence, the circulating serotypes and the antimicrobial susceptibility profile of Salmonella spp. strains in the State of Rio de Janeiro are scarce. Therefore, the aim of this study was to detect the presence of Salmonella spp. in live chickens and carcasses in slaughterhouses of the State of Rio de Janeiro, to identify the serotypes and to evaluate the antimicrobial susceptibility of these strains for fluoroquinolones and beta-lactams. Sixty cloacal swabs samples from broiler chickens and sixty samples of carcasses from six slaughterhouses under State Inspection were collected. The isolates were serotyped and resistance was tested to eight antimicrobials: enrofloxacin, ciprofloxacin, norfloxacin, cephalothin, ceftiofur, cefotaxime, amoxicillin/clavulanic acid and ampicillin by disc diffusion method. The results showed a prevalence of Salmonella spp. of 1.66% (1/60) in cloacal swabs samples and 26.66% (16/60) in carcasses. In cloacal swabs sample only Senftenberg (1.66%) serotype was isolated. In total, seven different serotypes were obtained from carcasses: Senftenberg (15%), followed by Mbandaka (8.3%), Schwarzengrund (3.3%), Cerro (3.3%), Ohio (3.3%), Minnesota (1.66%) and Tennessee (1.66%). Regarding antimicrobial susceptibility, 29 (87.87%) isolates were sensitive to all antimicrobials tested and 4 (12.12%) isolates were resistant to three or more beta-lactams antimicrobials. No susceptibility to fluoroquinolones was observed. These results showed a prevalence of Salmonella spp. higher than expected in slaughterhouses in the State of Rio de Janeiro, besides the presence of several serotypes of Salmonella spp. The resistance found for beta-lactams alerts to the spread of these strains through the food chain.

• Antimicrobial susceptibility Salmonella spp. serotype broilers Rio de Janeiro Brazil poultry carcass bacterioses

Abstract in Portuguese:

A presença de Salmonella spp. em produtos de origem avícola e seus subprodutos se mostra um grande desafio para a produção comercial. Dados de prevalência, dos sorotipos circulantes e do perfil de susceptibilidade antimicrobiana de cepas de Salmonella spp. no Estado do Rio de Janeiro são escassos. Portanto, objetivou-se detectar a presença Salmonella spp. em frangos vivos e carcaças em matadouros do Estados do Rio de Janeiro, identificar os sorotipos e avaliar a susceptibilidade antimicrobiana dessas cepas para fluoroquinolonas e betalactâmicos. Foram coletadas 60 amostras cloacais de frangos vivos e 60 amostras de carcaça de seis matadouros sob Inspeção Estadual (SIE). Os isolados foram sorotipificados e testados frente a oito antimicrobianos: enrofloxacina, ciprofloxacina, norfloxacina, cefalotina, ceftiofur, cefotaxima, amoxicilina/ácido clavulânico e ampicilina pelo método de difusão em disco. Os resultados mostraram uma prevalência de Salmonella spp. de 1,66% (1/60) em amostras de suabe de cloaca e de 26,66% (16/60) em carcaças. Em amostras de suabe de cloaca, somente o sorotipo Senftenberg (1,66%) foi isolado. No total, foram isolados sete sorotipos diferentes nas carcaças: Senftenberg (15%) o mais frequente, seguido por Mbandaka (8,3%), Schwarzengrund (3,3%), Cerro (3,3%), Ohio (3,3%), Minnesota (1,66%) e Tennessee (1,66%). Em relação à susceptibilidade antimicrobiana, 29 (87,87%) isolados foram sensíveis a todos os antimicrobianos testados e 4 (12,12%) isolados foram resistentes a pelo menos três antimicrobianos betalactâmicos ou mais. Não foi observada resistência às fluoroquinolonas. Os resultados encontrados demonstram uma prevalência de Salmonella spp. acima da esperada em matadouros do Estado do Rio de Janeiro, além da presença de vários sorotipos de Salmonella spp. A resistência encontrada para betalactâmicos alerta para a disseminação dessas cepas pela cadeia alimentar.

• Susceptiblidade antimicrobiana sorotipo Salmonella spp. frango carcaças Rio de Janeiro bacterioses

Abstract in English:

ABSTRACT.- Palma J.M., Lisboa R.C., Rodrigues D.P., Santos A.F.M., Hofer E. & Santana A.P. 2016. [Molecular characterization of Listeria monocytogenes from beef samples and cattle slaughterhouses located in the Federal District, Brazil.] Caracterização molecular de Listeria monocytogenes oriundas de cortes cárneos bovinos e de abatedouros frigoríficos de bovinos localizados no Distrito Federal, Brasil. Pesquisa Veterinária Brasileira 36(10):957-964. Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF 70910-900, Brazil. E-mail: joanamarchesini@gmail.com The aim of the study was the analysis of Listeria monocytogenes strains in beef samples as well as slaughterhouse environment, located in the Federal District, promote serotyping by polymerase chain reaction (PCR), perform antibiotic susceptibility and submit the strains to Pulsed-field gel electrophoresis (PFGE). A total of 125 beef samples were analyzed, 45 samples of carcasses swabs and 43 swab samples. It detected 13 strains of Listeria monocytogenes, 11 in beef samples. and 2 in slaughterhouse environment. No carcass swabs strains were isolated. Among the 13 strains of L. monocytogenes six strains of serotype 4b were found, five serotype 1/2c and two strains of serotype 1/2a. Among the 11 strains of L. monocytogenes found in beef, one (9.1%) strain showed resistance to erythromycin, one (9.1%) strain to gentamicin, one to ciprofloxacin (9.1%) and all strains (100%) were resistant to nalidixic acid. The two strains coming from the slaughterhouse drains, all (100%) were resistant to nalidixic acid and Sulfonamides. The analysis by pulsed field gel electrophoresis (PFGE) showed 13 different pulsotypes; they were grouped into three different clonal groups, coincidentally correlated with the three different serotypes found, what suggests a widespread dissemination of these profiles in the Federal District, Brazil.

• Listeria monocytogenes listeriosis meat eletroforese listeriose

Abstract in Portuguese:

RESUMO.- Palma J.M., Lisboa R.C., Rodrigues D.P., Santos A.F.M., Hofer E. & Santana A.P. 2016. [Molecular characterization of Listeria monocytogenes from beef samples and cattle slaughterhouses located in the Federal District, Brazil.] Caracterização molecular de Listeria monocytogenes oriundas de cortes cárneos bovinos e de abatedouros frigoríficos de bovinos localizados no Distrito Federal, Brasil. Pesquisa Veterinária Brasileira 36(10):957-964. Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF 70910-900, Brazil. E-mail: joanamarchesini@gmail.com Este trabalho teve como objetivo realizar a detecção de cepas de Listeria monocytogenes de cortes cárneos bovinos bem como no ambiente de abatedouros frigoríficos localizados no Distrito Federal, promover a sorotipificação pela reação em cadeia da polimerase (PCR), realizar antibiograma e submeter às cepas à eletroforese de campo pulsado (Pulsed-field gel electrophoresis - PFGE). Foram analisados um total de 125 cortes cárneos bovinos, 45 amostras de swabs de carcaças e 43 amostras de swabs em que foram detectados 13 cepas de Listeria monocytogenes, sendo 11 em cortes cárneos bovinos e 2 swabs de ambiente em um abatedouro frigorifico. Não foram isoladas cepas de swabs de carcaça. Dentre as 13 cepas de Listeria monocytogenes foram encontradas seis cepas do sorotipo 4b, cinco do sorotipo 1/2c e duas cepas do sorotipo 1/2a. Dentre as 11 cepas de L. monocytogenes encontradas em cortes cárneos bovino, uma (9,1%) cepa apresentou resistência a eritromicina, outra (9,1%) cepa a gentamicina e outra a ciprofloxacina (9,1%) e todas as cepas (100%) apresentaram resistência ao Ác. Nalidíxico. Das duas (2) cepas oriundas de ralos de abatedouro frigorífico, todas (100%) apresentaram resistência ao Ác. Nalidíxico e a sulfonamidas. A análise por eletroforese de campo pulsante (PFGE) demonstrou 13 diferentes pulsotipos, em que foram agrupados em 3 diferentes grupos clonais, que coincidentemente se correlacionavam com os 3 diferentes sorotipos encontrados sugerindo uma ampla disseminação desses perfis no Distrito Federal.

Abstract in English:

ABSTRACT.- Esposto E.M., Silva W.C.P., Reis C.M.F., Reis E.M.F., Ribeiro R.V., Rodrigues D.P. & Lázaro N.S. 2007. [Bacterial enteropathogens from fishes of a nutrient recycle system and its ecosystem.] Enteropatógenos bacterianos em peixes criados em uma estação de reciclagem de nutrientes e no ecossistema relacionado. Pesquisa Veterinária Brasileira 27(4):144-148. Departamento de Bacteriologia, Instituto Oswaldo Cruz, FIOCruz, Av. Brasil 4365, Pav. Rocha Lima, Manguinhos, Rio de Janeiro, RJ 21040-360, Brazil. E- mail: nslazaro@ioc.fiocruz.br The presence of bacterial enteropathogens from fishes of a nutrient recycle system from a Experimental Station in Petropolis, RJ, was evaluated in 72 samples from april 2000 to july 2001 Simultaneously was collected the mud used as organic manure and poultry beds localized next to the tanks. The isolation procedures included preenrichment in Peptone Water followed by enrichment with alcaline Peptone Water (pH 8.4-8.6), and streaked onto GSP Agar for the isolation of Aeromonas spp. and Plesiomonas shigelloides. For enteropathogenic bacteria of the Enterobacteriaceae family, 1ml samples were transferred for enrichment in Rappaport- Vassiladis broth and Kauffmann Tetrathionate Broth followed by streak onto Hektoen Enteric Agar and Salmonella-Shigella Agar. Simultaneously at each visit samples of water from fish and macrophyte tanks were collected for monitoring faecal coliforms (MPN) using A1 medium. Among the 116 isolates, Aeromonas spp. were the most frequent (67.2%) with 9 species (A. veronii, biogroup sobria, A. hidrophila, A. sobria, A. trota, A. eucrenophila, A. veronii biog. veronii, A. media, A. cavia and A. jandaei), followed by Edwardsiella tarda (16.4%), Plesiomonas shigelloides (12.9%) and Salmonella spp. (3.4%). The NMP of fecal coliforms showed higher values in the fish tanks (>1800/100ml).

• Enteropathogens wastewater fish farming

Abstract in Portuguese:

ABSTRACT.- Esposto E.M., Silva W.C.P., Reis C.M.F., Reis E.M.F., Ribeiro R.V., Rodrigues D.P. & Lázaro N.S. 2007. [Bacterial enteropathogens from fishes of a nutrient recycle system and its ecosystem.] Enteropatógenos bacterianos em peixes criados em uma estação de reciclagem de nutrientes e no ecossistema relacionado. Pesquisa Veterinária Brasileira 27(4):144-148. Departamento de Bacteriologia, Instituto Oswaldo Cruz, FIOCruz, Av. Brasil 4365, Pav. Rocha Lima, Manguinhos, Rio de Janeiro, RJ 21040-360, Brazil. E- mail: nslazaro@ioc.fiocruz.br The presence of bacterial enteropathogens from fishes of a nutrient recycle system from a Experimental Station in Petropolis, RJ, was evaluated in 72 samples from april 2000 to july 2001 Simultaneously was collected the mud used as organic manure and poultry beds localized next to the tanks. The isolation procedures included preenrichment in Peptone Water followed by enrichment with alcaline Peptone Water (pH 8.4-8.6), and streaked onto GSP Agar for the isolation of Aeromonas spp. and Plesiomonas shigelloides. For enteropathogenic bacteria of the Enterobacteriaceae family, 1ml samples were transferred for enrichment in Rappaport- Vassiladis broth and Kauffmann Tetrathionate Broth followed by streak onto Hektoen Enteric Agar and Salmonella-Shigella Agar. Simultaneously at each visit samples of water from fish and macrophyte tanks were collected for monitoring faecal coliforms (MPN) using A1 medium. Among the 116 isolates, Aeromonas spp. were the most frequent (67.2%) with 9 species (A. veronii, biogroup sobria, A. hidrophila, A. sobria, A. trota, A. eucrenophila, A. veronii biog. veronii, A. media, A. cavia and A. jandaei), followed by Edwardsiella tarda (16.4%), Plesiomonas shigelloides (12.9%) and Salmonella spp. (3.4%). The NMP of fecal coliforms showed higher values in the fish tanks (>1800/100ml).

Abstract in English:

ABSTRACT.- Pereira C.S., Amorim S.D., Santos A.F.M., Siciliano S., Moreno I.M.B., Ott P.H. & Rodrigues D.P. 2007. [Vibrio spp. isolated from marine mammals captured in coastal regions from southwestern to southern Brazil.] Vibrio spp. isolados de mamíferos marinhos capturados na região litorânea do sudeste ao sul do Brasil. Pesquisa Veterinária Brasileira 27(2):81-83. Laboratório de Enterobactérias, Departamento de Bacteriologia, Pavilhão Rocha Lima, Instituto Oswaldo Cruz, FIOCruz, Av. Brasil 4365, Rio de Janeiro, RJ 21045-900, Brazil. E-mail: csoarespereira@hotmail.com In the present investigation was evaluated the incidence of Vibrio spp. from superficial lesions at marine mammals beached or captured by fishing net in the southwestern (RJ) and southern (RS) coastal regions of Brazil. One hundred and ninety eight swabs were collected by DEENSP, GEMARS and Ceclimar institutes and sent to Labent/IOC/FIOCruz where the samples were submitted to enrichment in Alkaline Peptone Water (APW) added with 1% and 3% of sodium chloride (NaCl) incubated at 37oC for 18-24 hours. After the samples were streaked onto Thiossulfate Citrate Bile Sucrose Agar (TCBS), the suspected colonies were submitted to biochemical characterization. The results showed 108 strains, and Vibrio alginolyticus, V. parahaemolyticus, V. vulnificus and V. fluvialis were the main pathogens isolated. These results appoint the importance of surveillance and microbiological monitoring accomplishment and reinforcement of environmental protective programs applied to marine mammals endangered with extinction.

• Vibrionaceae aquatic ecosystem public health

Abstract in Portuguese:

ABSTRACT.- Pereira C.S., Amorim S.D., Santos A.F.M., Siciliano S., Moreno I.M.B., Ott P.H. & Rodrigues D.P. 2007. [Vibrio spp. isolated from marine mammals captured in coastal regions from southwestern to southern Brazil.] Vibrio spp. isolados de mamíferos marinhos capturados na região litorânea do sudeste ao sul do Brasil. Pesquisa Veterinária Brasileira 27(2):81-83. Laboratório de Enterobactérias, Departamento de Bacteriologia, Pavilhão Rocha Lima, Instituto Oswaldo Cruz, FIOCruz, Av. Brasil 4365, Rio de Janeiro, RJ 21045-900, Brazil. E-mail: csoarespereira@hotmail.com In the present investigation was evaluated the incidence of Vibrio spp. from superficial lesions at marine mammals beached or captured by fishing net in the southwestern (RJ) and southern (RS) coastal regions of Brazil. One hundred and ninety eight swabs were collected by DEENSP, GEMARS and Ceclimar institutes and sent to Labent/IOC/FIOCruz where the samples were submitted to enrichment in Alkaline Peptone Water (APW) added with 1% and 3% of sodium chloride (NaCl) incubated at 37oC for 18-24 hours. After the samples were streaked onto Thiossulfate Citrate Bile Sucrose Agar (TCBS), the suspected colonies were submitted to biochemical characterization. The results showed 108 strains, and Vibrio alginolyticus, V. parahaemolyticus, V. vulnificus and V. fluvialis were the main pathogens isolated. These results appoint the importance of surveillance and microbiological monitoring accomplishment and reinforcement of environmental protective programs applied to marine mammals endangered with extinction.

Abstract in English:

Lázaro N.S., Tibana A., Rodrigues D.P., Reis E.M.F., Quintaes B.R. & Hofer E. 2004. Antimicrobial resistance and R-plasmid in Salmonella spp from swine and abattoir environments. Pesquisa Veterinária Brasileira 24(2):57-60. Depto Epidemiologia e Saúde Pública, Instituto de Veterinária, UFRRJ, Seropédica, RJ 23890-000, Brazil. E-mail: nslazaro@aol.com Salmonella serovars isolated from swine are of particular interest not only because of the pathogenic potential for this animal species, but also due to its relevance with regard to public health. On basis of the profile of resistance to antimicrobials, 13 Salmonella strains were selected which belonged to the serovars Muenster (7), Derby (4), Typhimurium (1), and Braenderup (1). They were isolated from healthy swine as well as from the abattoir environment in the state of Rio de Janeiro. All strains of Salmonella were subjected to bacterial conjugation, and the E. coli K12 Nalr Lac+ F standard strain was used as receptor, with the purpose to verify the ability to transfer the resistance marks. Gene transfer phenomenon was detected in seven strains, and except Salmonella Typhimurium which transconjugated to Sm, Tc and Su, the remaining ones were characterized by transferring mark Su only. By plasmidial analysis of strains used and their respective transconjugants, 63 Kb plasmid was found, which was probably related to S. Typhimurium resistance.

• Salmonella swine antimicrobial resistance R-plasmid.

Abstract in Portuguese:

Lázaro N.S., Tibana A., Rodrigues D.P., Reis E.M.F., Quintaes B.R. & Hofer E. 2004. Antimicrobial resistance and R-plasmid in Salmonella spp from swine and abattoir environments. Pesquisa Veterinária Brasileira 24(2):57-60. Depto Epidemiologia e Saúde Pública, Instituto de Veterinária, UFRRJ, Seropédica, RJ 23890-000, Brazil. E-mail: nslazaro@aol.com Salmonella serovars isolated from swine are of particular interest not only because of the pathogenic potential for this animal species, but also due to its relevance with regard to public health. On basis of the profile of resistance to antimicrobials, 13 Salmonella strains were selected which belonged to the serovars Muenster (7), Derby (4), Typhimurium (1), and Braenderup (1). They were isolated from healthy swine as well as from the abattoir environment in the state of Rio de Janeiro. All strains of Salmonella were subjected to bacterial conjugation, and the E. coli K12 Nalr Lac+ F standard strain was used as receptor, with the purpose to verify the ability to transfer the resistance marks. Gene transfer phenomenon was detected in seven strains, and except Salmonella Typhimurium which transconjugated to Sm, Tc and Su, the remaining ones were characterized by transferring mark Su only. By plasmidial analysis of strains used and their respective transconjugants, 63 Kb plasmid was found, which was probably related to S. Typhimurium resistance.

Abstract in English:

Lázaro N.S., Tibana A., Reis E.M.F., Rodrigues D.P., Quintaes B.R. & Hofer E. 2004. [Antimicrobial susceptibility pattern and plasmid profile in Salmonella Muenster isolated from swine and abattoir environment, Brazil.] Padrão de susceptibilidade a antimicrobianos e perfil plasmidial em Salmonella Muenster isoladas de suínos e do ambiente de abatedouros. Pesquisa Veterinária Brasileira 24(2):65-70. Depto Epidemiologia e Saúde Pública, Inst.Veterinária, UFRRJ, Seropédica, RJ 23890-000, Brazil. E-mail: nslazaro@aol.com Thirty-eight strains of Salmonella Muenster, isolated from swine and the abattoir environment, in the State of Rio de Janeiro, Brazil, from March 1991 to February 1992, were analyzed for the presence of plasmids. The strains were selected according to their profile regarding the antimicrobials: streptomycin, tetracycline, sulphonamide and sulfametoxazole-trimethoprim. Thirteen strains were resistant to one or several antimicrobials, 18 with intermediate degree and seven were sensitive. Plasmids varying in size from 1.2 Kb to 42 Kb were detected in 37 (97.36%) of the 38 samples, corresponding to 11 different profiles (P1- P11), varying from 1 to 6 plasmids per model. The number and plasmids diversity was greater than the resistance marks for strains. The plasmid of 2.85 Kb was the most frequent, being present in 83.78% of the 37 strains; only the one of 7.5 Kb was detected at the two slaughterhouses. There was no parallelism between resistance pattern and plasmidial profile, and a same antibiotype was found in several plasmidial profiles. The results of the present investigation, allowed us to conclude that the plasmid characterization is an useful and simple tool for the epidemiological typing of this sorovar.

• Salmonella Muenster swine antimicrobial resistance plasmids.

Abstract in Portuguese:

Lázaro N.S., Tibana A., Reis E.M.F., Rodrigues D.P., Quintaes B.R. & Hofer E. 2004. [Antimicrobial susceptibility pattern and plasmid profile in Salmonella Muenster isolated from swine and abattoir environment, Brazil.] Padrão de susceptibilidade a antimicrobianos e perfil plasmidial em Salmonella Muenster isoladas de suínos e do ambiente de abatedouros. Pesquisa Veterinária Brasileira 24(2):65-70. Depto Epidemiologia e Saúde Pública, Inst.Veterinária, UFRRJ, Seropédica, RJ 23890-000, Brazil. E-mail: nslazaro@aol.com Thirty-eight strains of Salmonella Muenster, isolated from swine and the abattoir environment, in the State of Rio de Janeiro, Brazil, from March 1991 to February 1992, were analyzed for the presence of plasmids. The strains were selected according to their profile regarding the antimicrobials: streptomycin, tetracycline, sulphonamide and sulfametoxazole-trimethoprim. Thirteen strains were resistant to one or several antimicrobials, 18 with intermediate degree and seven were sensitive. Plasmids varying in size from 1.2 Kb to 42 Kb were detected in 37 (97.36%) of the 38 samples, corresponding to 11 different profiles (P1- P11), varying from 1 to 6 plasmids per model. The number and plasmids diversity was greater than the resistance marks for strains. The plasmid of 2.85 Kb was the most frequent, being present in 83.78% of the 37 strains; only the one of 7.5 Kb was detected at the two slaughterhouses. There was no parallelism between resistance pattern and plasmidial profile, and a same antibiotype was found in several plasmidial profiles. The results of the present investigation, allowed us to conclude that the plasmid characterization is an useful and simple tool for the epidemiological typing of this sorovar.