{"id":4711,"date":"2020-03-30T09:00:33","date_gmt":"2020-03-30T09:00:33","guid":{"rendered":"https:\/\/endoscopiaterapeutica.net\/pt\/uncategorized\/transmissao-do-novo-coronavirus\/"},"modified":"2021-09-17T18:38:22","modified_gmt":"2021-09-17T18:38:22","slug":"transmissao-do-novo-coronavirus","status":"publish","type":"post","link":"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/transmissao-do-novo-coronavirus\/","title":{"rendered":"Transmiss\u00e3o do novo coronav\u00edrus"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p><strong>VIROLOGIA<\/strong><\/p>\n<ul>\n<li>O SARS-CoV-2 \u00e9 um betacoronav\u00edrus, medindo entre 50-200 nan\u00f4metros, muito semelhante ao coronav\u00edrus causador da SARS.<\/li>\n<li>Prote\u00edna mais importante da sua superf\u00edcie \u00e9 a prote\u00edna S (spike), a qual tem afinidade pela enzima de convers\u00e3o de angiotensina 2 (ACE2)<\/li>\n<li>O v\u00edrus se liga a ACE2 para invadir a c\u00e9lula hospedeira. Esse \u00e9 o mesmo receptor utilizado pelo v\u00edrus da SARS [1].<\/li>\n<li>Por isso o nome SARS-CoV-2<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/03\/coronavirus-structure.png\" data-rel=\"penci-gallery-image-content\" ><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10845\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/coronavirus-structure.png\" alt=\"\" width=\"300\" height=\"220\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Figura 1: <a href=\"https:\/\/en.wikipedia.org\/wiki\/Severe_acute_respiratory_syndrome_coronavirus_2\">https:\/\/en.wikipedia.org\/wiki\/Severe_acute_respiratory_syndrome_coronavirus_2<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>TRANSMISS\u00c3O<\/strong><\/p>\n<p><strong><em>Como ocorre a transmiss\u00e3o do SARS-CoV-2?<\/em><\/strong><\/p>\n<ul>\n<li>A <strong>principal via<\/strong> de transmiss\u00e3o \u00e9 atrav\u00e9s de <strong>GOT\u00cdCULAS<\/strong> respirat\u00f3rias, semelhante \u00e0 dissemina\u00e7\u00e3o da influenza.<\/li>\n<li>Atrav\u00e9s das got\u00edculas, o v\u00edrus liberado nas secre\u00e7\u00f5es respirat\u00f3rias quando uma pessoa tosse, espirra ou fala pode infectar outra pessoa se entrar em contato direto com as membranas mucosas;<\/li>\n<li>Essas got\u00edculas normalmente n\u00e3o viajam mais do que dois metros, e n\u00e3o permanecem suspensas no ar. Por isso o distanciamento social \u00e9 t\u00e3o importante.<\/li>\n<li>A <strong>segunda via<\/strong> importante de transmiss\u00e3o ocorre quando uma pessoa toca uma superf\u00edcie infectada (fomites) e depois toca nos olhos, nariz ou boca. Fomites n\u00e3o porosos (pl\u00e1stico, metal) s\u00e3o mais propensos a propagar a infec\u00e7\u00e3o do que os n\u00e3o porosos (roupas, papel, etc)<\/li>\n<li>A WHO e o CDC questionam a relev\u00e2ncia da transmiss\u00e3o pelo ar (<em>airborne transmission<\/em>), embora n\u00e3o a descartem.<\/li>\n<li>Transmiss\u00e3o atrav\u00e9s de part\u00edculas de aeross\u00f3is em <strong>curta dist\u00e2ncia<\/strong> \u00e9 uma alternativa plaus\u00edvel [12]<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><em>Saiba mais sobre got\u00edculas, aeross\u00f3is e transmiss\u00e3o nesse post: <a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/goticulas-aerossois-e-transmissao-do-coronavirus\/\">clique aqui<\/a><\/em><\/strong><\/p>\n<p><strong><em>Link para documento da WHO: <a href=\"https:\/\/www.who.int\/publications-detail\/modes-of-transmission-of-virus-causing-covid-19-implications-for-ipc-precaution-recommendations\" target=\"_blank\" rel=\"noopener noreferrer\">clique aqui<\/a><\/em><\/strong><\/p>\n<p><strong><em>Audio Interview: Practical Measures to Help Prevent Covid-19 NEJM: <a href=\"https:\/\/www.nejm.org\/doi\/pdf\/10.1056\/NEJMe2006742?articleTools=true\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.nejm.org\/doi\/pdf\/10.1056\/NEJMe2006742?articleTools=true<\/a><\/em><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong><em>Qual a diferen\u00e7a entre got\u00edculas e aeross\u00f3is?<\/em><\/strong><\/p>\n<ul>\n<li>Got\u00edculas s\u00e3o part\u00edculas &gt; 5-10 \u03bcm, que geralmente n\u00e3o percorrem dist\u00e2ncias maiores que 1-2 metros.<\/li>\n<li>Aeross\u00f3is apresentam di\u00e2metro menor que 5 \u03bcm. Podem ser resultantes da evapora\u00e7\u00e3o de gotas maiores ou podem estar presentes em part\u00edculas de poeira. Eles podem permanecer no ar por longos per\u00edodos de tempo e percorrer dist\u00e2ncias superiores a 1 m.<\/li>\n<\/ul>\n<p><strong><em>\u00a0<\/em><\/strong><\/p>\n<p><strong><a href=\"https:\/\/www.cdc.gov\/infectioncontrol\/guidelines\/isolation\/scientific-review.html\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Veja aqui defini\u00e7\u00f5es do CDC sobre droplets e airborne transmission:\u00a0<\/em><\/a><\/strong><\/p>\n<p><strong><em><a href=\"https:\/\/www.cdc.gov\/infectioncontrol\/guidelines\/isolation\/scientific-review.html\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.cdc.gov\/infectioncontrol\/guidelines\/isolation\/scientific-review.html<\/a><\/em><\/strong><\/p>\n<p><strong><em>\u00a0<\/em><em>Saiba mais sobre got\u00edculas, aeross\u00f3is e transmiss\u00e3o nesse post:<\/em><em> <a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/goticulas-aerossois-e-transmissao-do-coronavirus\/\">clique aqui<\/a><\/em><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong><em>O v\u00edrus pode ser transmitido pelo ar?<\/em><\/strong><\/p>\n<p>Essa \u00e9 uma grande discuss\u00e3o ainda em aberto. Ainda precisamos de mais estudo para compreender melhor a transmiss\u00e3o do v\u00edrus. Alguns autores consideram que a transmiss\u00e3o pelo ar em dist\u00e2ncias curtas pode ser uma via importante de transmiss\u00e3o.<\/p>\n<p>Em uma an\u00e1lise de mais de 75.000 casos da China, n\u00e3o foi relatado casos de transmiss\u00e3o pelo ar. Tampouco foi relatada transmiss\u00e3o oral-fecal, apesar de terem sido isolados RNA do v\u00edrus em amostra de fezes. [2, 8]<\/p>\n<p>Em uma carta ao editor publicada no NEJM, os pesquisadores realizaram um estudo experimental, simulando a nebuliza\u00e7\u00e3o do v\u00edrus no laborat\u00f3rio, identificando sua presen\u00e7a em aeross\u00f3is mesmo 3 horas ap\u00f3s. No entanto, a WHO faz algumas ressalvas quanto a esse estudo:<\/p>\n<ol>\n<li>\u201cThis is a high-powered machine that does not reflect normal human cough conditions.\u201d<\/li>\n<li>\u201cFurther, the finding of COVID-19 virus in aerosol particles up to 3 hours does not reflect a clinical setting in which aerosol-generating procedures are performed\u201d<\/li>\n<li>\u201cIn addition, it is important to note that the detection of RNA in environmental samples based on PCR-based assays is not indicative of viable virus that could be transmissible\u201d<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>Para se ter uma ideia de como essa discuss\u00e3o \u00e9 complicada, ainda hoje se discute se o v\u00edrus da influenza (muito mais conhecido e estudado do que o coronav\u00edrus) \u00e9 transmiss\u00edvel pelo ar. Lembrando que o v\u00edrus da influenza apresenta mecanismo de transmiss\u00e3o muito semelhante ao SARS-CoV-2.<\/p>\n<p>No entanto, a transmiss\u00e3o pelo ar \u00e9 poss\u00edvel em circunst\u00e2ncias espec\u00edficas, como nos procedimentos geradores de aeross\u00f3is. Por esse motivo, as recomenda\u00e7\u00f5es da WHO e do CDC dizem que os profissionais de sa\u00fade devem se equipar com m\u00e1scaras tipo respiradores (N95 ou PFF2). [2,3]<\/p>\n<p>Em um artigo para o center for infection diseases research and policy, a Prof. Lisa Brousseau, da University of Illinois em Chicago, alerta para a falta de evid\u00eancias sobre os modos de transmiss\u00e3o, e sobre a possibilidade da transmiss\u00e3o pelo ar em curtas dist\u00e2ncia, ou seja, na dist\u00e2ncia que trabalhamos com os pacientes. Talvez a transmiss\u00e3o pelo ar em longas dist\u00e2ncias e longos per\u00edodos (como exemplo da tuberculose) realmente n\u00e3o seja importante, mas n\u00e3o podemos nos esquecer da inala\u00e7\u00e3o de aeross\u00f3is em curta dist\u00e2ncia. [12]<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Pessoas assintom\u00e1ticas podem transmitir o v\u00edrus?<\/strong><\/p>\n<p>Existem evid\u00eancias que portadores assintom\u00e1ticos podem transmitir o v\u00edrus e duas publica\u00e7\u00f5es recentes fazem relatos de infec\u00e7\u00f5es \u00e0 partir de portadores assintom\u00e1ticos.<\/p>\n<p>Uma Research Letter\u00a0 publicada no JAMA em Fevereiro relata o caso de uma portadora assintom\u00e1tica, sem altera\u00e7\u00f5es cl\u00ednicas, laboratoriais e de imagem, que transmitiu o v\u00edrus para 5 membros de sua fam\u00edlia. A portadora assintom\u00e1tica era habitante de Wuhan, epicentro da pandemia e foi visitar os demais membros de sua fam\u00edlia, que moravam em outra cidade. Todos os cinco membros adoeceram e testaram positivo para Covid-19 com altera\u00e7\u00f5es cl\u00ednicas, laboratoriais e em tomografias de t\u00f3rax.<\/p>\n<p>A portadora assintom\u00e1tica permaneceu em isolamento e nunca desenvolveu sintomas ou altera\u00e7\u00f5es dos exames laboratoriais ou de imagem, mesmo ap\u00f3s a confirma\u00e7\u00e3o laboratorial por RT-PCR. Toda a sequ\u00eancia de eventos detalhada na figura abaixo sugere que a transmiss\u00e3o ocorreu \u00e0 partir da portadora assintom\u00e1tica.[4]<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_10847\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/03\/wang.png\" data-rel=\"penci-gallery-image-content\" ><img decoding=\"async\" aria-describedby=\"caption-attachment-10847\" class=\"wp-image-10847 size-medium\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/wang.png\" alt=\"\" width=\"300\" height=\"144\" \/><\/a><p id=\"caption-attachment-10847\" class=\"wp-caption-text\">Ref \u2013 Wang M. Presumed Symptomatic Carrier Transmission of Covid-19. JAMA 2020. Doi:10.1001\/jama.2020.2565<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Essa mesma sequ\u00eancia de eventos foi mostrada em outras fam\u00edlias estudadas na China, com pacientes em fase pr\u00e9-sintom\u00e1tica.[5]<\/p>\n<p>Ainda n\u00e3o existem estimativas seguras da propor\u00e7\u00e3o de portadores assintom\u00e1ticos do v\u00edrus, e nem do seu real potencial de transmiss\u00e3o. Pesquisadores de Nanjing, na China, seguiram uma s\u00e9rie de 24 pacientes assintom\u00e1ticos com PCR positiva para Covid-19. Esses pacientes eram contatos pr\u00f3ximos de pacientes infectados. Durante o seguimento apenas 7 pacientes (29,2%) permaneceram realmente assintom\u00e1ticos, sem altera\u00e7\u00f5es cl\u00ednicas, laboratoriais e de imagem. A m\u00e9dia de idade desses pacientes era de 14 anos. [6]<\/p>\n<p>Um estudo conduzido com os passageiros e tripula\u00e7\u00e3o do navio Diamond Princess mostrou que a propor\u00e7\u00e3o de portadores assintom\u00e1ticos naquela popula\u00e7\u00e3o foi de 17,9% (95%CI 15,5-20,2%) [7]<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Pode acontecer transmiss\u00e3o pela saliva e fezes?<\/strong><\/p>\n<p>O RNA da SARS-CoV-2 foi detectado em amostras de sangue e fezes segundo alguns estudos [8-11]. Mas de acordo com um relat\u00f3rio conjunto da OMS-China [8], a transmiss\u00e3o fecal-oral n\u00e3o foi um fator significativo na dissemina\u00e7\u00e3o da infec\u00e7\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Tosse e espirro gera aerossol?<\/strong><\/p>\n<p>Sim.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Existe correla\u00e7\u00e3o entre carga viral e sintomas?<\/strong><\/p>\n<p>N\u00e3o se sabe<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>REFER\u00caNCIAS<\/strong><\/p>\n<ol>\n<li>Kenneth McIntosh. Coronavirus disease 2019 (COVID-19). In UpToDate, Post TW (Ed), UpToDate,\u00a0Waltham, MA. (Acessado em 28 Mar\u00e7o, 2020.)<\/li>\n<li>Modes of transmission of virus causing COVID-19:implications for IPC precaution recommendations. Dispon\u00edvel em : <a href=\"https:\/\/www.who.int\/publications-detail\/modes-of-transmission-of-virus-causing-covid-19-implications-for-ipc-precaution-recommendations\">https:\/\/www.who.int\/publications-detail\/modes-of-transmission-of-virus-causing-covid-19-implications-for-ipc-precaution-recommendations<\/a><\/li>\n<li>Centers for Disease Control and Prevention. Interim Infection Prevention and Control Recommendations for Patients with Confirmed 2019 Novel Coronavirus (2019-nCoV) or Patients Under Investigation for 2019-nCoV in Healthcare Settings. February 3, 2020. https:\/\/www.cdc.gov\/coronavirus\/2019-nCoV\/hcp\/infection-control.html<\/li>\n<li>Wang M. Presumed Ssymptomatic Carrier Transmission of Conid-19. JAMA 2020. Doi:10.1001\/jama.2020.2565<\/li>\n<li>Quian G, Young N, Ma AHY, Wang L, Li G, Chen X, Chen X. A Covid-19 Transmission of a Family Cluster by presimptomatic infectors in China.CID 2020. doi:10.1093\/cid\/ciaa316<\/li>\n<li>Hu Z, Song C, Xu C, Jin G, Chen Y, Xu X et al. Clinical characteristics of 24 asymptomatic infections with COVID-19 screened among close contacts in Nanjing, China. Sci Cina Lif Sci 2020, 63, <a href=\"https:\/\/doi.org\/10.1007\/s11427-020-1661-04\">https:\/\/doi.org\/10.1007\/s11427-020-1661-04<\/a>.<\/li>\n<li>Mizumoto K, Kagaya K, Zarebski A, Chowell B. Estimating the asymptomatic proportion of coronavirus disease 2019 (Covid-19) cases on board the Diamond Princess cruise ship, Yokohama Japan, 2020.<a href=\"http:\/\/www.eurosurveillance.org\/\">www.eurosurveillance.org<\/a>.\u00a0doi:10.2807\/1560-7917.ES.2020.25.10.2000180<\/li>\n<li>World Health Organization. Report of the WHO-China Joint Mission on Coronavirus Disease 2019 (COVID-19) 16-24 February 2020 [Internet]. Geneva: World Health Organization; 2020 Available from:https:\/\/www.who.int\/docs\/default- source\/coronaviruse\/who-china-joint-mission-on-covid-19-final-report.pdf.<\/li>\n<li>Detection of Novel Coronavirus by RT-PCR in Stool Specimen from Asymptomatic Child, China. Tang A, Tong ZD, Wang HL, Dai YX, Li KF, Liu JN, Wu WJ, Yuan C, Yu ML, Li P, Yan JB. Emerg Infect Dis. 2020;26(6) Epub 2020 Jun 17.<\/li>\n<li>Detectable 2019-nCoV viral RNA in blood is a strong indicator for the further clinical severity.Chen W, Lan Y, Yuan X, Deng X, Li Y, Cai X, Li L, He R, Tan Y, Deng X, Gao M, Tang G, Zhao L, Wang J, Fan Q, Wen C, Tong Y, Tang Y, Hu F, Li F, Tang X. Emerg Microbes Infect. 2020;9(1):469. Epub 2020 Feb 26.<\/li>\n<li>Detection of SARS-CoV-2 in Different Types of Clinical Specimens. Wang W, Xu Y, Gao R, Lu R, Han K, Wu G, Tan W. JAMA. 2020;<\/li>\n<li>Lisa Brosseau. COVID-19 transmission messages should hinge on science.\u00a0Fonte: http:\/\/www.cidrap.umn.edu\/news-perspective\/2020\/03\/commentary-covid-19-transmission-messages-should-hinge-science<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Esse artigo foi escrito em coautoria com Dra. Daniela Milhomem Cardoso<\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; VIROLOGIA O SARS-CoV-2 \u00e9 um betacoronav\u00edrus, medindo entre 50-200 nan\u00f4metros, muito semelhante ao&hellip;<\/p>\n","protected":false},"author":712,"featured_media":5343,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[151],"tags":[],"ano":[146],"tipo":[159],"volume":[263],"class_list":["post-4711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-assuntosgerais","ano-146","tipo-outros","volume-volume-i"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Transmiss\u00e3o do novo coronav\u00edrus &#8226; Endoscopia Terapeutica<\/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:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/transmissao-do-novo-coronavirus\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transmiss\u00e3o do novo coronav\u00edrus\" \/>\n<meta property=\"og:description\" content=\"&nbsp; VIROLOGIA O SARS-CoV-2 \u00e9 um betacoronav\u00edrus, medindo entre 50-200 nan\u00f4metros, muito semelhante ao coronav\u00edrus causador da SARS. 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