{"id":26324,"date":"2024-05-15T15:04:16","date_gmt":"2024-05-15T18:04:16","guid":{"rendered":"https:\/\/www.grupomedcof.com.br\/blog\/?p=26324"},"modified":"2025-07-02T11:37:37","modified_gmt":"2025-07-02T14:37:37","slug":"tuberculose-agentes-etiologicos-e-transmissao","status":"publish","type":"post","link":"https:\/\/www.grupomedcof.com.br\/blog\/tuberculose-agentes-etiologicos-e-transmissao\/","title":{"rendered":"Tuberculose: agentes etiol\u00f3gicos e transmiss\u00e3o"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sum\u00e1rio<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/tuberculose-agentes-etiologicos-e-transmissao\/#O_que_causa_tuberculose\" >O que causa tuberculose?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/tuberculose-agentes-etiologicos-e-transmissao\/#Como_ocorre_a_transmissao_da_tuberculose\" >Como ocorre a transmiss\u00e3o da tuberculose?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/tuberculose-agentes-etiologicos-e-transmissao\/#Determinantes_da_chance_de_infeccao\" >Determinantes da chance de infec\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/tuberculose-agentes-etiologicos-e-transmissao\/#O_metodo_que_te_aprova\" >O m\u00e9todo que te aprova<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>A <strong>tuberculose (TB)<\/strong>, doen\u00e7a infectocontagiosa causada pela bact\u00e9ria <em>Mycobacterium tuberculosis<\/em>, se mant\u00e9m como um desafio de sa\u00fade global. No Brasil, a tuberculose tem relev\u00e2ncia epidemiol\u00f3gica significativa, pois o pa\u00eds apresenta alta incid\u00eancia, influenciada por fatores socioecon\u00f4micos, desigualdades regionais e a coexist\u00eancia com o HIV. Apesar dos esfor\u00e7os no controle da tuberculose no Brasil, a persist\u00eancia da epidemia e a ocorr\u00eancia de cepas resistentes demandam conhecimento sobre o assunto e medidas abrangentes. Por isso, teremos uma s\u00e9rie de posts sobre a tuberculose. No post de hoje, vamos conversar sobre os agentes etiol\u00f3gicos e a forma de transmiss\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"O_que_causa_tuberculose\"><\/span><strong>O que causa tuberculose?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>O complexo Mycobacterium tuberculosis (MTBC) inclui diferentes esp\u00e9cies capazes de causar tuberculose em humanos e animais.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>M tuberculosis<\/strong><\/td><\/tr><tr><td>M bovis<\/td><\/tr><tr><td>M africanum<\/td><\/tr><tr><td>M canettii<\/td><\/tr><tr><td>M microti<\/td><\/tr><tr><td>M pinnipedii<\/td><\/tr><tr><td>M caprae<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXd8bbYK1HzGDI_6ZEJsrM85OHt5elXnc_l_cij250xFH4SGpwdmQD5bb9-h-D8E3XZpeFGhBbaS_ZPTsr-4KvOzN-qiVUlh98EbgfgHTxr8vQNHXKp7gJW2PmVJhnpmP891Rz0alg?key=RyfrmCEXUZBwHcEgo9JZdQ\" alt=\"A OMS estima que a tuberculose ainda seja a 2\u00b0 principal causa de morte\npor doen\u00e7a infecciosa em todo 0 mundo (depois do HIV) e que quase 1\/3\nda popula\u00e7\u00e3o mundial esta infectada pelo M. tuberculosis.\"\/><\/figure>\n\n\n\n<p>O quadro abaixo re\u00fane algumas caracter\u00edsticas das principais esp\u00e9cies.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>M tuberculosis ou bacilo de Koch<\/strong><\/td><td><strong>M bovis<\/strong><\/td><\/tr><tr><td>Prefer\u00eancia pelo par\u00eanquima pulmonar<\/td><td>Principal agente em \u00e1reas rurais<\/td><\/tr><tr><td>Transmiss\u00e3o de pessoa a pessoa<\/td><td>associado \u00e0 zoonose por consumo de leite n\u00e3o pasteurizado, com import\u00e2ncia hist\u00f3rica e regional, mas com preval\u00eancia reduzida atualmente gra\u00e7as \u00e0 pasteuriza\u00e7\u00e3o.<\/td><\/tr><tr><td><\/td><td>Maior frequ\u00eancia de apresenta\u00e7\u00f5es extrapulmonares, especialmente a TB ganglionar.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXePAs_BXGy6o55ey-DOz26wule06cH39YcfRK_4pe3K2V9aKnw3dsr1HkMXBgQyTgHx5fPjXVBNS36sR6l-yilb4lqTxWr27PTYllCJw2OGuxKFBCIqwrJ1Q5_wGrVpAdg7HlE-oQ?key=RyfrmCEXUZBwHcEgo9JZdQ\" alt=\"VOCESABIA?\nTB preenche crit\u00e9rios de prioriza\u00e7\u00e3o de um agravo de sa\u00fade p\u00fablica:\n\n* 1 incid\u00eancia\/preval\u00eancia.\u00a0\n\n* 1 relev\u00e2ncia para sociedade.\n\n* 1 potencial de cura.\u00a0\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Como_ocorre_a_transmissao_da_tuberculose\"><\/span>Como ocorre a transmiss\u00e3o da tuberculose?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A transmiss\u00e3o da TB, na sua forma mais comum, ocorre quando o paciente \u00e9 classificado como bacil\u00edfero, ou seja, que possui alto n\u00famero de bacilos (suficiente para transmitir para outra pessoa). A transmiss\u00e3o ocorre atrav\u00e9s de got\u00edculas, pela fala, espirro ou tosse.<\/p>\n\n\n\n<p>Embora possam se depositar em superf\u00edcies, a <em>Mycobacterium tuberculosis<\/em> n\u00e3o sobrevive por longos per\u00edodos fora do organismo hospedeiro, e a via f\u00f4mite n\u00e3o \u00e9 considerada relevante para a transmiss\u00e3o..<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Determinantes_da_chance_de_infeccao\"><\/span><strong>Determinantes da chance de infec\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Como citamos acima, a <strong>concentra\u00e7\u00e3o de bacilos expelidos pelo doente<\/strong> determina se ele \u00e9 capaz de transmitir tuberculose para outra pessoa ou n\u00e3o. Classificamos da seguinte maneira:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bacil\u00edferos<\/strong> \u2192 A positividade na prova tubercul\u00ednica (PPD) n\u00e3o define se o paciente \u00e9 bacil\u00edfero mas sim se houve infec\u00e7\u00e3o latente ou ativa. O termo \u2018bacil\u00edfero\u2019 \u00e9 mais precisamente determinado pela baciloscopia positiva do escarro.\n<ul class=\"wp-block-list\">\n<li><strong>Multibacil\u00edferos<\/strong> \u2192 baciloscopia positiva no escarro, BAAR positivo. Geralmente, causa a forma cavit\u00e1ria da doen\u00e7a.<\/li>\n\n\n\n<li><strong>Paucibacil\u00edferos<\/strong> \u2192 cultura positiva e escarro negativo. Geralmente, causa a forma n\u00e3o cavit\u00e1ria.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>N\u00e3o bacil\u00edferos<\/strong> \u2192 formas extrapulmonares de TB.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXf8tiFlVwqyJl-c6LY_xj5Qo4aHPVkl88tA7sVW776-xi1itgKfYuahLmvgAqW7weSKB9C9g17SljC4sVGQsbjqXHR4EkiQXOUnqWQsjgE1sH5R3HvLrswcOmj8fsjHH4yt4jXpaA?key=RyfrmCEXUZBwHcEgo9JZdQ\" alt=\"A maioria infectada n\u00e3o \u00e9 bacil\u00edfera, ou seja, n\u00e3o transmite\"\/><\/figure>\n\n\n\n<p>Outro determinante \u00e9 a <strong>intensidade e a frequ\u00eancia de contato entre o paciente doente e o paciente exposto<\/strong>. Para iniciar a infec\u00e7\u00e3o, s\u00e3o necess\u00e1rios 20 a 200 bacilos.&nbsp;<\/p>\n\n\n\n<p><strong>Condi\u00e7\u00f5es ambientais<\/strong> tamb\u00e9m s\u00e3o considerados determinantes de infec\u00e7\u00e3o. As part\u00edculas podem ficar horas dispersas no ar mas s\u00e3o rapidamente dilu\u00eddas ao ar livre, sendo desativadas pela luz solar ultravioleta. Dessa forma, o risco de transmiss\u00e3o da tuberculose aumenta em ambientes fechados e com pouca ilumina\u00e7\u00e3o natural.<\/p>\n\n\n\n<p>A <strong>resist\u00eancia natural da pessoa exposta<\/strong> tamb\u00e9m \u00e9 um determinante, considerando aspectos gen\u00e9ticos, a presen\u00e7a ou n\u00e3o de doen\u00e7as debilitantes ou imunodepressoras. Contactantes pr\u00f3ximos e frequentes, especialmente em ambiente domiciliar, t\u00eam risco de infec\u00e7\u00e3o que pode variar entre 30% e 50%, dependendo da carga bacilar e ventila\u00e7\u00e3o do ambiente.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXdVFhcJUWoltVhQMIsn4AqYREdv3hSZpCxFyeOMu3tRLFgKf6xXYPWAoJWydm1MvAdJ22QAyI8zc4yAnoq-FSNQEgssdZQiqHJFaD9mh7WWIZ_jIt3vwWUFCkPoROwvzXR7BttZ-Q?key=RyfrmCEXUZBwHcEgo9JZdQ\" alt=\"Quanto maior o in\u00f3culo de bacilos e menor a resist\u00eancia natural do:\ncontactante, maior \u00e9 a chance de infec\u00e7\u00e3o.\u00a0\"\/><\/figure>\n\n\n\n<p>Agora que conversamos sobre os agentes etiol\u00f3gicos e a transmiss\u00e3o, aproveite para anotar os principais pontos do tema e continue ligado no nosso blog, pois iremos conversar mais sobre tuberculose. Vale lembrar que a tuberculose \u00e9 uma doen\u00e7a de notifica\u00e7\u00e3o compuls\u00f3ria no Brasil e o diagn\u00f3stico e tratamento s\u00e3o gratuitos pelo SUS. Bons estudos!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-o-metodo-que-te-aprova\"><span class=\"ez-toc-section\" id=\"O_metodo_que_te_aprova\"><\/span>O m\u00e9todo que te aprova<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Se voc\u00ea quer garantir a sua aprova\u00e7\u00e3o nas provas de resid\u00eancia, ent\u00e3o conhe\u00e7a o grupo MedCof e a metodologia que j\u00e1 aprovou&nbsp;<a href=\"https:\/\/www.grupomedcof.com.br\/blog\/presenca-da-medcof-nas-aprovacoes-em-residencia-medica-no-brasil\/\">mais de 10 mil<\/a>&nbsp;residentes pelo pa\u00eds. Confira abaixo o <a href=\"https:\/\/youtube.com\/shorts\/JJQP0UGwIKU?si=91Jdze7oOXgtPqVF\">depoimento<\/a> de uma de nossas alunas que esteve presente no Medcof day:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"youtube-embed\" data-video_id=\"\"><iframe loading=\"lazy\" title=\"DEPOIMENTOS DOS ALUNOS - MEDCOF DAY - SIMULADO NACIONAL\" width=\"696\" height=\"392\" src=\"https:\/\/www.youtube.com\/embed\/JJQP0UGwIKU?feature=oembed&#038;enablejsapi=1\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A tuberculose (TB), doen\u00e7a infectocontagiosa causada pela bact\u00e9ria Mycobacterium tuberculosis, se mant\u00e9m como um desafio de sa\u00fade global. <\/p>\n","protected":false},"author":16,"featured_media":26333,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[217,195],"tags":[208,196,3041,1422,1139,1423],"ppma_author":[3614],"class_list":{"0":"post-26324","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-aps","8":"category-infectologia","9":"tag-aps","10":"tag-infectologia","11":"tag-revisado-por-rafael-miranda","12":"tag-tosse","13":"tag-tuberculose","14":"tag-tuberculose-causas"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v27.4) - 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