{"id":3095,"date":"2021-12-13T13:15:10","date_gmt":"2021-12-13T13:15:10","guid":{"rendered":"https:\/\/convet.net\/factors-de-virulencia-de-le-coli\/"},"modified":"2022-03-18T09:57:22","modified_gmt":"2022-03-18T09:57:22","slug":"factors-de-virulencia-de-le-coli","status":"publish","type":"post","link":"https:\/\/convet.net\/ca\/factors-de-virulencia-de-le-coli\/","title":{"rendered":"Factors de Virul\u00e8ncia de l&#8217;E.Coli"},"content":{"rendered":"<h2 style=\"text-align: center;\"><strong>Enterobacteri que forma part de la microbiota del tracte digestiu dels animals sans.<\/strong><\/h2>\n<p><!--more--><\/p>\n<blockquote><p><strong>Escherichia coli (E. Coli)<\/strong> \u00e9s una enterobacteria que forma part de la microbiota del tracte digestiu dels animals sans. Ajuda en el manteniment de l&#8217;home\u00f2stasi intestinal en contribuir al desenvolupament estructural i funcional correcte del tracte digestiu. La gran majoria d&#8217;a\u00efllats presents a l&#8217;intest\u00ed s\u00f3n comensals i apat\u00f2gens per als porcs.<\/p><\/blockquote>\n<p>Tanmateix, alguns a\u00efllats d&#8217;E. coli tenen factors de virul\u00e8ncia que els atorguen un <strong>car\u00e0cter patogen.<\/strong><br \/>\n Com ara les diferents adhesines o factors d&#8217;adher\u00e8ncia i les enterotoxines. Els principals quadres cl\u00ednics deguts a ceps pat\u00f2gens d&#8217;e. coli que produeixen diarrees en porcs inclourien: la colibacilosi neonatal, la diarrea colibacilar postdestete i la malaltia dels edemes.<\/p>\n<p>La <strong>col\u00b7libacilosi<\/strong> \u00e9s una malaltia infecciosa del tracte digestiu que s&#8217;associa als porcs. S&#8217;associa sobretot a les fases de lactaci\u00f3 i deslletament. Aquests factors de virul\u00e8ncia permeten classificar els a\u00efllats d&#8217;E. coli causants dels quadres diarreics de colibacilosi en dos patotips ben diferenciats:<\/p>\n<h2 data-fontsize=\"17\" data-lineheight=\"34\"><strong>Patotips d&#8217;E. Coli<\/strong><\/h2>\n<ul>\n<li>\n<h3 data-fontsize=\"18\" data-lineheight=\"30\"><strong>Coli enterotoxig\u00e8nic<\/strong> ( <strong>ETEC<\/strong> )<\/h3>\n<\/li>\n<\/ul>\n<p>S&#8217;adhereix mitjan\u00e7ant les adhesines, les m\u00e9s importants s\u00f3n les <strong>fimbrials<\/strong> , estructures de naturalesa proteica que permeten la uni\u00f3 a la paret intestinal. Als a\u00efllats d&#8217;ETEC porcins les f\u00edmbries m\u00e9s freq\u00fcents s\u00f3n les anomenades F4, F5, F6, F41 i F18.<\/p>\n<p>Aquesta uni\u00f3 permet la colonitzaci\u00f3, per E. coli, d&#8217;una part de l&#8217;intest\u00ed i la producci\u00f3 posterior d&#8217;enterotoxines. Hi ha dos grans grups d&#8217;enterotoxines que es classifiquen en funci\u00f3 de la seva resist\u00e8ncia a la temperatura, les designades <strong>toxines termol\u00e0bils (LT) i les toxines termoresistents<\/strong> (ST).<\/p>\n<p>Els a\u00efllats d&#8217;ETEC s\u00f3n el principal patotip identificat a les diarrees neonatals associades a E. coli durant les primeres 24-48 hores de vida dels garrins, estenent-se fins a la primera setmana. Durant la resta de la lactaci\u00f3, E. coli t\u00e9 un paper secundari. Participa en infeccions mixtes, juntament amb altres microorganismes pat\u00f2gens.<\/p>\n<ul>\n<li>\n<h3 data-fontsize=\"18\" data-lineheight=\"30\"><strong>Coli enteropatogen<\/strong> ( <strong>EPEC<\/strong> )<\/h3>\n<\/li>\n<\/ul>\n<p>Els ceps d&#8217;E.coli enteropatogen o EPEC, tamb\u00e9 anomenats d&#8217;adhesi\u00f3 i esborrat, causen malaltia cl\u00ednica en unir-se als enter\u00f2cits mitjan\u00e7ant una prote\u00efna de la membrana externa anomenada <strong>intimina (eae)<\/strong> . Aquesta uni\u00f3 produeix la destrucci\u00f3 o \u201cesborrat\u201d de les microvellositats. Aix\u00f2 redueix la superf\u00edcie intestinal i, per tant, altera la digesti\u00f3 i absorci\u00f3 dels nutrients.<\/p>\n<p>La <strong>diarrea col\u00b7libacilar postdeslletament<\/strong> tamb\u00e9 es deu a ceps d&#8217;E. coli enterotixig\u00e8niques (ETEC). Les quals tenen una combinaci\u00f3 de factors de fixaci\u00f3 i enterotoxines necess\u00e0ries perqu\u00e8 es produeixi la malaltia intestinal. Aquesta uni\u00f3 i adher\u00e8ncia permet que la ETEC resisteixi els moviments intestinals normals. D&#8217;aquesta manera pot colonitzar l&#8217;intest\u00ed per, posteriorment, produir i injectar les seves enterotoxines, com les toxines termol\u00e0bils o termoestables.<\/p>\n<p>Els ceps d&#8217;E. coli implicats en la <strong>malaltia dels edemes<\/strong> mostren caracter\u00edstiques similars a les soques d&#8217;ETEC de la col\u00b7libacilosi postdetete, quant a l&#8217;epidemiologia i patog\u00e8nesi d&#8217;uni\u00f3 a l&#8217;intest\u00ed dels porcs en transici\u00f3. No obstant aix\u00f2, els ceps s\u00f3n generalment del tipus adhesina fimbrial F18 i tamb\u00e9 contenen verotoxines espec\u00edfiques o shigatoxines com Stx2e. Aquestes toxines entren al torrent sanguini del porc i fan malb\u00e9 els vasos sanguinis extra intestinals. Produeixen signes neurol\u00f2gics i edema gelatin\u00f3s al cap, parpelles, laringe, est\u00f3mac i mesocolon.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enterobacteri que forma part de la microbiota del tracte digestiu dels animals sans.<\/p>\n","protected":false},"author":2,"featured_media":2916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-3095","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-veterinaria-ca","category-19","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Factors de Virul\u00e8ncia de l&#039;E.Coli - Convet | Laboratorio de An\u00e1lisis Alimentario y Veterinario Especializado<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/convet.net\/ca\/factors-de-virulencia-de-le-coli\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Factors de Virul\u00e8ncia de l&#039;E.Coli - 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