Résumé
All 250 children presenting with diarrhoea at 2 teaching hospitals in Mosul, Iraq over a 9-month period were studied for the presence of Yersinia spp. in stools by cold-enrichment culture at 4 [0]C for 21 days. Pathogenicity of the isolated Yersinia was determined. Antibodies to Y. enterocolitica were raised for rapid Yersinia detection in the stool. Yersinia spp. were isolated from the stools of only 4 patients; 3 isolates were identified as Y. enterocolitica and 1 was Y. pseudotuberculosis. The blood culture was also positive for Y. enterocolitica in 1 case. The antibiogram test for the isolated Yersinia was determined. Cross-reaction between Y. pseudotuberculosis and Salmonella typhi or S. paratyphi B, and between Y. enterocolitica and Brucella was detected serologically
Sujets)
Femelle , Humains , Mâle , Yersinia/isolement et purification , Fèces/microbiologie , Yersinia/pathogénicité , Tests de sensibilité microbienneRésumé
O gênero Yersinia compreende três espécies patogênicas para humanos: Y. pestis, Y. enterocolitica e Y. pseudotuberculosis. A patogenicidade de Yersinia está ligada à presença do plasmideo de 70-kb (pYV) que é comum às três espécies e codifica um sistema de secreção do tipo III e um conjunto de proteínas de virulência, incluindo aquelas conhecidas como Yops (Yersinia outer proteins), que são exportadas por este sistema quando as células do hospedeiro são infectadas pela bactéria. Duas Yops translocadoras (YopB e YopD) se inserem na membrana plasmática e funcionam no transporte de seis efetoras (YopO, YopH, YopM, YopJ e YopT) para o citosol da célula do hospedeiro. As Yops efetoras funcionam interferindo em múltiplas vias de sinalização da célula infectada. Como consequência, a resposta imune inata e adaptativa do hospedeiro fica afetada. Este trabalho enfoca o papel das Yops na modulação da resposta imune do hospedeiro
Sujets)
Humains , Yersinia/immunologie , Yersinia/pathogénicité , Anticorps/immunologie , Cytokines/immunologie , Phagocytose/immunologie , Yersinioses/immunologie , Yersinioses/anatomopathologieRésumé
Este trabalho realiza uma revisäo sobre os principais enteropatógenos bacterianos, enfocando principalmente aspectos de sistemática, fatores de virulência e algumas características fisiológicas
Sujets)
Humains , Aeromonas/pathogénicité , Bacillus cereus/pathogénicité , Clostridium/pathogénicité , Diarrhée/physiopathologie , Dysenterie/physiopathologie , Entérocolite/physiopathologie , Escherichia coli/pathogénicité , Gastroentérite/physiopathologie , Salmonella/pathogénicité , Shigella/pathogénicité , Vibrio cholerae/pathogénicité , Vibrio parahaemolyticus/pathogénicité , Virulence , Yersinia/pathogénicitéRésumé
Säo abordados os principais agentes etiológicos da gastroenterite humana, assim como o diagnóstico microbiológico de cada agente
Sujets)
Humains , Aeromonas/pathogénicité , Bacillus cereus/pathogénicité , Clostridium/pathogénicité , Diarrhée/complications , Escherichia coli/pathogénicité , Gastroentérite/étiologie , Infections bactériennes/diagnostic , Infections à rotavirus/virologie , Salmonella/pathogénicité , Vibrio cholerae/pathogénicité , Vibrio parahaemolyticus/pathogénicité , Yersinia/pathogénicité , Aeromonas/isolement et purification , Campylobacter/isolement et purification , Clostridium/isolement et purification , Milieux de culture , Escherichia coli/isolement et purification , Vibrio cholerae/isolement et purificationRésumé
Trata-se do primeiro relato de ocorrência de Yersinia rohdei na Argentina, isolada de água de recreaçäo da Laguna del Monte, Província de Buenos Aires.A cepa foi classificada como Y.rohdei biotipo 1, sorotipo 0:38 e fagotipo Xo.
Sujets)
Yersinia/pathogénicité , Eau de PlaisanceRésumé
Se ha investigado la presencia de bacterias del género Yersinia en 50 muestras de pollo faenados destinados al consumo y en 65 muestras de alimento balanceado para aves. Se enriquecieron en solución de buffer de fosfatos 0,067 M pH 7,6 en NaCl 0,145 M (PBS) a 4 -C durante 21 días. El post-enriquecimiento se realizó con KOK al 0,5%. Los aislamientos se hicieron sobre agar Salmonella-Shigella (SS) y agar MacConkey (MC). Las colonias sospechosas se sembraron en triple azúcar hierro (TSI). Las colonias se purificaron a través de pruebas bioquímicas, serológicas y de fagotipia. De las muestras de pollo se aisló Y. enterocolítica en un 10% con las siguientes biovar (B), serovar (O) y fagovar (Lis): B:1,0:6,47, Lis Xz; B:1, 0:6, Lis Xz; y B:1,0:5, Lis Xz; Y. intermedia en un 40%, B:1,0:52,Lis Xz y B:1,0:52,53,54,Lis Xz (NRA, nitrato reductasa de tipo A); Y. frederiksenii en un 4%, 0:10, K1,25,35,38,46, Lis Xz (citrato +) y 0:10,K1,25,35,38,46,Lis Xz (ONPG -: citrato +); Y kristensenii en un 2%, no aglutinable, Lis Xo. Del alimento balanceado para aves no se aisló Yersinia spp. todas las cepas fueron negativas a las pruebas de dependencia del calcio para el crecimiento y autoaglutinación a 37 -C indicandola ausencia de plasmidios de virulencia. También fueron negativas a la prueba de Sereny. Cuatro cepas fueron enterotoxina positivas. De los resultados obtendios se concluye que las cepas de Yersinia aisladas a partir de pollos no significan un riesgo para la salud
Sujets)
Animaux , Contamination des aliments , Microbiologie alimentaire , Viande/analyse , Aliment pour animaux/microbiologie , Yersinia/isolement et purification , Poulets/microbiologie , Spécificité d'espèce , Résistance microbienne aux médicaments , Peau/microbiologie , Virulence , Yersinia/classification , Yersinia/pathogénicitéRésumé
1. Strains of Yearsinia enterocolitica, Y. intermedia, Y frederiksenii and Y. kristensenii from non-human sources were examined for virulence factors. Four of these strains were positive for autoagglutination, three were calcium dependent at 37-C, three produced lipase, five had the ability to bind Congo red, six had pyrazinamidase activity, and two had a 42 MDa plasmid. 2. One strain (Y. enterocolitica 0:5) was lethal for mice and had the ability to invade guinea pig eyes and HeLa cells. After inoculation of mice by the intravenous route, this strain was isolated from the cecum. The spleen, liver, kidneys and lymph nodes presented necrosis. After intragastric inoculation, the strain was isolated from all of the organs and tissues examined. 3. Three of the remaining strains invaded HeLa cells but none caused guinea pig conjunctivitis. 4. After intragastric inoculation, all the strains were isolated from the cecum but disappeared between dys 3 and 6. After intravenous infection, three strains produced necrosis of the spleen and were more invasive, eliciting infection in various organs. The remaining strains caused hypertrophy and hyperplasua of Peyer's patches and/or lymph nodes. 5. These results indicate that Y. enterocolitica 0:5 can be considered as virulent as typical European Y. enterocolitica strains. The remaining strains perphaps induce a weak immune response independent of virulence factors