{"id":8351,"date":"2026-10-22T16:36:44","date_gmt":"2026-10-22T13:36:44","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/infeccao-oportunista\/"},"modified":"2026-10-22T16:36:47","modified_gmt":"2026-10-22T13:36:47","slug":"infeccao-oportunista","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/infeccao-oportunista\/","title":{"rendered":"Infec\u00e7\u00e3o oportunista"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Infec\u00e7\u00e3o oportunista (do lat. <em>opportunus<\/em> \u2014 conveniente, favor\u00e1vel) \u2014 \u00e9 uma doen\u00e7a causada por microrganismos que normalmente coexistem de forma inofensiva com o ser humano ou permanecem em estado latente, mas adquirem propriedades patog\u00eanicas agressivas na presen\u00e7a de imunodefici\u00eancia profunda (redu\u00e7\u00e3o da defesa imunol\u00f3gica humana).<\/p>\n\n<h2 id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\" class=\"wp-block-heading\">Etiologia e fisiopatologia<\/h2>\n\n<p class=\"wp-block-paragraph\">A pele, as membranas mucosas e o intestino s\u00e3o colonizados por uma quantidade significativa de diversos microrganismos \u2014 bact\u00e9rias, v\u00edrus, protozo\u00e1rios e fungos. Al\u00e9m disso, v\u00e1rios herpes-v\u00edrus latentes permanecem no organismo por toda a vida (por exemplo, citomegalov\u00edrus, v\u00edrus Epstein-Barr).<\/p>\n\n<p class=\"wp-block-paragraph\">Em uma pessoa saud\u00e1vel, uma potente imunidade mediada por c\u00e9lulas T mant\u00e9m esses \u00abvizinhos\u00bb sob controle, impedindo-os de penetrar nos \u00f3rg\u00e3os internos e causar doen\u00e7as.<\/p>\n\n<p class=\"wp-block-paragraph\">A patog\u00eanese da infec\u00e7\u00e3o oportunista \u00e9 desencadeada quando esse controle \u00e9 suprimido (imunodefici\u00eancia grave de c\u00e9lulas T). Isso ocorre nas seguintes situa\u00e7\u00f5es:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>no est\u00e1gio de AIDS<\/strong> \u2014 na infec\u00e7\u00e3o pelo HIV;<\/li>\n\n\n\n<li><strong>durante o uso de imunossupressores potentes<\/strong> \u2014 ap\u00f3s o transplante de \u00f3rg\u00e3os de doadores;<\/li>\n\n\n\n<li><strong>durante a quimioterapia agressiva<\/strong> \u2014 no tratamento de doen\u00e7as oncol\u00f3gicas.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Na aus\u00eancia do fator de conten\u00e7\u00e3o, a flora potencialmente patog\u00eanica come\u00e7a a se multiplicar de forma descontrolada, atravessa as barreiras teciduais, alcan\u00e7a a circula\u00e7\u00e3o sist\u00eamica e causa les\u00f5es extensas nos pulm\u00f5es, no c\u00e9rebro, no trato gastrointestinal e em outros \u00f3rg\u00e3os.<\/p>\n\n<h2 id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\" class=\"wp-block-heading\">Import\u00e2ncia cl\u00ednica<\/h2>\n\n<p class=\"wp-block-paragraph\">As infec\u00e7\u00f5es oportunistas s\u00e3o uma causa frequente de mortalidade entre pacientes imunocomprometidos. Exemplos cl\u00e1ssicos dessas patologias incluem:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>pneumonia por Pneumocystis<\/strong>;<\/li>\n\n\n\n<li><strong>esofagite por Candida<\/strong>;<\/li>\n\n\n\n<li><strong>toxoplasmose cerebral<\/strong>;<\/li>\n\n\n\n<li><strong>retinite por citomegalov\u00edrus<\/strong> \u2014 inflama\u00e7\u00e3o da retina que leva \u00e0 cegueira;<\/li>\n\n\n\n<li><strong>colite<\/strong>.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Essas infec\u00e7\u00f5es frequentemente constituem uma indica\u00e7\u00e3o cl\u00ednica direta para a realiza\u00e7\u00e3o de testagem para HIV.<\/p>\n\n<p class=\"wp-block-paragraph\">O diagn\u00f3stico e o tratamento das infec\u00e7\u00f5es oportunistas constituem um desafio m\u00e9dico complexo: exigem a administra\u00e7\u00e3o de medicamentos antimicrobianos em combina\u00e7\u00e3o com o tratamento da causa subjacente da imunossupress\u00e3o, a fim de restaurar a imunidade do paciente.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Infec\u00e7\u00e3o oportunista (do lat. <em>opportunus<\/em> \u2014 conveniente, favor\u00e1vel) \u2014 \u00e9 uma doen\u00e7a causada por microrganismos que normalmente coexistem de forma inofensiva com o ser humano ou permanecem em estado latente, mas adquirem propriedades patog\u00eanicas agressivas na presen\u00e7a de imunodefici\u00eancia profunda (redu\u00e7\u00e3o da defesa imunol\u00f3gica humana).<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-8351","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Infec\u00e7\u00e3o oportunista: defini\u00e7\u00e3o m\u00e9dica e vis\u00e3o geral | Voka Wiki<\/title>\n<meta name=\"description\" content=\"Infec\u00e7\u00e3o oportunista (do lat. opportunus 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