科学简报:2022年Clade IIb爆发期间Mpox(前猴痘)病毒的检测和传播

原文来自:https://www.cdc.gov/poxvirus/mpox/about/science-behind-transmission.html
变更摘要
*截至2023年2月2日的更新
越来越多的科学证据表明,一些人可以在多囊卵巢综合征症状出现前一到四天将多囊卵巢病毒传播给其他人。目前没有证据表明从未出现过症状的人会将mpox病毒传播给其他人。
关于mpox病毒如何传播的知识在不断发展。在当前疫情期间,人们主要是在性活动期间因接触mpox患者的皮肤或粘膜表面(如喉咙、肛门或直肠)上的mpox损伤而感染的。一些感染是由于在临床情况下使用锋利的仪器对皮肤损伤进行采样而造成的,CDC建议反对的做法.猴痘还通过皮肤穿孔和纹身传播,以及在没有尖锐物接触的情况下通过职业传播给医疗工作者;这些病例的确切传播途径尚不清楚。通过接触受污染的表面或物体(即螨虫或被动媒介)而感染的风险被认为较低。一些病例报告称,在受感染伴侣出现皮疹、皮损或其他疾病迹象或症状(即与症状前感染的伴侣接触)之前,曾与该伴侣发生过性接触。没有明确的传播病例与接触从未出现疾病症状或体征(即无症状感染)的感染者有关。随着有关mpox病毒感染的新科学证据和其他信息可用,本简介将更新。
本文目录
一、受影响人群和临床表现 1
二、皮肤皮疹以外的人体样本中的猴痘病毒及其传播意义 2
三、检测表面、材料和物体上的猴痘病毒 4
四、在没有疾病症状或体征的情况下检测和传播猴痘 4
另、参考文献 6
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一、受影响人群和临床表现
在本次疫情期间,大多数mpox病毒感染是通过与有症状的人密切接触传播的,主要是在性接触期间。大多数感染是在男性与男性的性接触期间传播的[1-7]; 然而,异性性传播[8-14]通过与照料者的非性皮肤接触传播给儿童[15-17]通过带有皮肤损伤的尖锐刺绣进行传播[18-21]通过身体穿孔和纹身[22-24]此外,还报告了在缺乏全面或足够有效的个人防护装备(PPE)的情况下的职业接触[25, 26].
皮疹通常伴有肛门生殖器或口咽/口周粘膜损伤,是诊断时mpox病毒感染的主要症状[1, 4-6, 13, 27-37]患者也经常报告发烧、寒战、头痛和淋巴结病;然而,与以往的疫情相比,这些症状通常先于皮疹发作(即前驱症状),在目前的疫情中,多达一半的患者报告皮疹为他们的第一症状[1, 4, 5, 27, 38].从感染到发病的估计潜伏期平均为7天,上限约为3周[1, 5, 13, 39-43]目前,证据表明所有人都会感染疾病(即皮疹或其他相关症状),但有些人在出现症状或体征(即症状前)之前的四天内也会将病毒传播给其他人[41, 42, 44, 45]目前没有证据表明,感染但最终清除了感染而没有发展成疾病(即无症状感染)的人传播了mpox病毒。
二、皮肤皮疹以外的人体样本中的痘病毒及其传播意义
建议使用皮肤损伤(如水疱、溃疡)的拭子(而非尖锐物)通过聚合酶链反应(PCR)检测mpox病毒,以确认有症状的人是否感染,因为皮肤损伤含有最高浓度的病毒(图)最有可能产生积极的结果[31, 34, 46-52]临床拭子样本中病毒DNA的浓度与存在的具有复制能力的病毒数量相关,表明PCR评估的病毒负荷越大,感染的可能性越大[53].PCR已在多种样本中检测到病毒DNA(表); 然而,仅从皮肤病变拭子、口咽拭子,肛门直肠拭子以及尿道拭子和结膜拭子及精液中分离出具有复制能力(即潜在传染性)的病毒(表). 病毒DNA通常在发病后3周内仍能检测到[47, 54-60]尽管上呼吸道拭子中周期阈值(Ct)值>35(即低病毒载量)的标本在此时间之后被报告(长达41天,可能73天)[54],唾液(最多76天)[58]和精液(最多54天)[58]在一项单一研究中,仅在发病后的前3周内,在皮肤病变拭子、肛门直肠拭子,口咽拭子或精液中检测到具有复制能力的病毒[34]。接触皮肤和粘膜损伤完全愈合的多功能性肠病患者未报告感染。
口咽和唾液:
当前疫情中多发性肺炎的临床表现值得注意的是,在诊断时口咽和口周病变的发病率很高[1, 4-6, 27].口咽粘膜可出现典型的mpox病毒感染病变[1]多项研究通过PCR在鼻咽和口咽拭子中检测到mpox病毒DNA[9, 29, 34, 38, 51, 55, 61-67]口咽拭子可以包括来自拭子粘膜病变和唾液的病毒。至少有两份报告描述了从这些标本中回收具有复制能力的病毒[34, 55]也有记录表明,感染源是与口腔结痂患者的口腔接触(接吻)[68]对口咽病变和非口咽病变患者的唾液进行PCR也检测到了痘病毒DNA[38, 52, 61, 66, 69, 70]; 然而,在没有口咽损伤的情况下,还没有明确的报道描述仅从唾液中分离出复制活性病毒。在某些情况下,唾液中的病毒DNA浓度与皮肤损伤(即同时采集的唾液和皮肤损伤)配对样本中观察到的病毒DNA的浓度相当[38, 69]总的来说,这一证据表明接触口咽和唾液可以传播感染;然而,数据不足以确定暴露时是否需要口腔病变。
肛门:
当前疫情中多发性肠病的临床表现也值得注意,因为诊断时肛门和肛周病变的发病率很高[1, 4-6, 27].肛门粘膜也可出现典型的多囊卵巢综合征病毒感染病变[1, 71, 72]多项研究已通过PCR在肛门直肠拭子中检测到mpox病毒DNA,包括从没有可见肛门周围病变或没有直肠炎的人身上采集的肛门直肠签[34, 45, 55, 61, 62, 67, 69, 73]在两份报告中,拭子产生了具有复制能力的病毒[34, 73]通过肛门粘膜接触传播,例如通过插入性肛门接触(例如阴茎或手指)或通过肛门肛门肛管传播,尤其难以评估,因为这种接触通常发生在性交期间的其他亲密身体接触中,包括皮肤接触。目前还没有报告能够确定接触肛门直肠粘膜是唯一的感染源。然而,肛门直肠粘膜损伤的存在是mpox的特征,并且能够在肛门直肠拭子中恢复具有复制能力的病毒,这种拭子的病毒DNA浓度与皮肤损伤相当[48](图)至少有一份报告中的结果与同时采集的皮肤和肛门直肠拭子(即配对样本)的结果具有可比性[31]支持肛门直肠接触可传播感染。
精液:
用PCR在感染者精液中检测到了痘病毒DNA[34, 38, 59, 66, 67, 69, 74-76]在三份报告中,精液中产生了具有复制能力的病毒[34, 59, 76],但到目前为止,还没有报道过接触精液是mpox病毒传播的唯一可能方式(例如,使用精液在体外施肥)。通过接触精液传播,如通过肛门、阴道或口腔的接受性性接触,尤其难以评估,因为这种接触通常发生在包括皮肤接触的性交环境中。精液中病毒DNA的浓度低于皮肤损伤中观察到的浓度[38, 69, 74](图). 流行病学数据目前表明,接触精液可能会传播感染,但目前的数据不足以明确支持这种接触是感染源。
尿液和尿道粘膜:
几项研究已经通过PCR在尿液或尿道拭子中检测到了mpox病毒DNA[9, 62, 63, 65, 67, 69, 75]在一例病例中,尿道拭子也产生了具有复制能力的病毒;没有尿道损伤[62]未发现与尿液接触有关的流行病学传播病例,经评估,病毒DNA的浓度低于皮肤损伤的浓度(图)包括成对皮肤病变的样本[9, 65]流行病学数据目前表明,接触尿液或尿道粘膜可能会传播感染,但目前的数据不足以明确支持这种接触是感染源。
结膜或眼液:
PCR已在眼睑病变的结膜拭子或拭子中以及有证据表明眼部多痘病毒感染的人的角膜上皮中检测到多痘毒DNA[61, 65, 77-80]在一例病例中,结膜拭子产生了具有复制能力的病毒[65]; 然而,迄今为止,没有任何传播与接触结膜液或眼组织有关。在一个病例中,结膜炎患者的结膜拭子中的病毒DNA浓度与成对皮肤病变相当,但眼睑或结膜上没有病变[77]因此,接触结膜或眼液可能会传播感染,尤其是在有结膜炎的情况下,但目前的数据不足以肯定这种接触是感染源。
血液:
在血浆和血清标本中用PCR很容易检测出痘病毒DNA[9, 29, 34, 38, 44, 55, 59, 60, 63, 65, 67, 75]然而,迄今为止还没有研究发现血液或血液制品中存在复制能力强的病毒,尽管很少有研究人员尝试培养病毒,因为通常检测到的DNA浓度很低(图). 迄今为止,没有因接触血液或血液制品而传播的病例。评估时,病毒DNA的浓度低于皮肤损伤和其他接触源样品中观察到的浓度(图)包括成对的皮肤损伤[9, 55, 63, 65]或成对结痂/结痂[38]流行病学数据目前不足以证明血液接触是感染源。
粪便:
有两项研究报告了用PCR检测粪便中的mpox病毒DNA[38, 69]; 然而,尚未从粪便中分离出具有复制能力的病毒,传播也未在流行病学上与接触粪便有关。流行病学数据目前不足以支持接触粪便作为感染源。
阴道:
在最有可能通过性接触获得mpox病毒的顺性别女性中,当前疫情的临床表现是诊断时生殖器损伤的高流行率[8, 13, 34, 81-84]三项研究报告了通过PCR在阴道拭子中检测mpox病毒DNA[13, 34]以及外阴和宫颈病变[85]尚未从阴道粘膜或阴道液中分离出复制抑制病毒。通过阴道或口腔性交接触阴道液体传播尤其难以评估,因为这种接触通常发生在包括皮肤接触的性交环境中。然而,尽管缺乏明确的流行病学证据将阴道接触与传播联系起来,但来自两例病例的间接证据[8]这与一个似是而非的假设是一致的,即mpox可通过接触外阴阴道组织和体液进行性传播。
母乳:
目前,现有数据不足以估计母乳中可能存在的多聚体病毒DNA或具有复制能力的病毒的程度。目前没有流行病学数据支持母乳接触是感染源。由于母乳接触通常包括皮肤接触,因此确定通过母乳传播对评估尤其具有挑战性。
受污染的锐器伤以及刺穿和纹身:
在目前的疫情中,至少有四例记录在案的医护人员通过皮肤穿透伤感染了mpox病毒,这种皮肤穿透伤是由用于皮肤损伤取样的非血性锐器造成的;在所有病例中,医护人员感染后的第一个或唯一的病灶都出现在接种点[18-21].CDC建议不要使用锐器对病变进行采样涉及的尖锐物被水泡或脓疱物质污染;然而,没有对锋利物进行病毒DNA或复制能力强的病毒的检测。
多份报告表明,成人和儿童在接受穿刺和纹身的情况下都可以传播mpox病毒[16, 22-24]调查了20起涉及不良无菌措施的案件,导致暴露在受源患者污染的纹身和穿孔材料中。在设备(如锋利物、镊子和剪刀等其他工作工具)和表面(如椅子、车间表面)上检测到病毒DNA[23]然而,在这些报告中,没有一份报告能够充分说明复制能力强的病毒的存在,也没有明确的流行病学证据能够准确地解释传播是如何发生的,尽管最初的皮疹损伤往往首先出现在穿孔或纹身的部位[22-24]。
三、检测表面、材料和物体上的猴痘病毒
在本次疫情期间,在有症状的多功能性肠病患者的家庭和病房中发现了广泛的表面多功能性肺病病毒污染[86-89],在表面上评估时,病毒浓度通常较低(即报告的研究中Ct值>30)[89]和空气样品[90]。尽管多次尝试分离具有复制能力的病毒,但产生可培养病毒的唯一目标是那些被预计污染最严重的病毒。例如,在一项基于医院的对患者隔离室的研究中,这些物品包括医疗服务提供者检查患者后使用的手套、患者浴室中的肥皂分配器操作杆和患者床上的毛巾[88]在另一项基于医院的研究中,产生可复制病毒的样本包括在患者房间更换床单时采集的空气样本,以及在护理患者的提供者穿戴和脱下PPE的区域采集的地板拭子[86]。在当前疫情期间,没有记录到因接触表面、材料或其他物体而导致传播的病例,这些人在护理多发性肺炎患者时采取了建议的预防措施家或在医疗环境2018年发生一起多功能性卵巢综合征病例,原因是接触了患者肮脏的床上用品;然而,在这种情况下,工人没有穿戴完整的个人防护装备(即只穿戴一次性围裙和手套)[91]。其他可能的职业获得性多功能性有机污染物案例(排除了尖锐物暴露)归因于在缺乏充分或有效的个人防护装备的情况下多功能性无机污染物暴露[25, 26].
四、在没有疾病症状或体征的情况下检测和传播猴痘
新出现的证据表明,一些患者可以在出现可识别的症状或体征之前传播mpox病毒(即症状前传播)。虽然在一些从未出现症状的人的样本中检测到低水平的mpox病毒DNA,但目前没有证据表明这些人对其他人具有传染性。需要进行更大规模的研究和建模,以了解有多少病例是由在症状出现之前传播病毒的人引起的,并确定在何种程度上(如果有的话),一些被评估为症状前向他人传播了mpox病毒的人可能没有症状感染。
症状前感染
将mpox的潜伏期(即感染后发病的时间)与其系列间隔(即指数病例发病与继发病例发病之间的时间)进行比较,这与感染mpox病毒的人能够在疾病症状和体征出现之前传播病毒的可能性是一致的出现。[41, 42]在肛门直肠拭子中检测到痘病毒DNA[44, 62, 74, 92]、尿道拭子[62],生殖器拭子[44],口咽拭子[44]和唾液[44]样本采集时既没有明显症状也没有报告疾病症状的人群。其中一些样本还从肛门直肠拭子中产生了具有复制能力的病毒[44, 74]和尿道拭子[62],其中一些患者在初次样本采集后的几周内进行检测时,发现了新的血清学证据,证明接触了正痘病毒[44, 74]流行病学调查提供了足够的数据来明确评估传播时间和发病时间,已证实mpox病毒的性传播发生在发病前1-4天[45]。
无症状感染
有记录在案的病例表明,接触过多杀性大肠杆菌病毒的人从未出现疾病症状或体征,但其样本(即肛门直肠拭子、口咽拭子,生殖器拭子和唾液)的病毒DNA检测浓度很低,接近检测限值。然而,由于Ct值高(即病毒DNA浓度低),没有对样本进行复制能力病毒评估[44]这些人中的大多数在儿童时期接受过天花疫苗接种或作为接触后预防措施。在其余未接种疫苗的人中,没有人显示出明显的血清转化证据。迄今为止,没有任何传播病例与接触从未出现症状或体征(即无症状感染)的感染者有明确联系。
图.根据采样暴露源得出的猴痘病毒浓度(摘自Palich等人。[47])

*在本研究中,PCR检测为弱阳性(35≤Ct<40)或阴性(Ct≥40)的临床样本被排除在本分析之外。所有样本均为诊断后采集的第一批样本,发病后平均5天(IQR 3-6)。未对样本进行培养测试,以确认是否存在感染性病毒。值得注意的是,在初步诊断后14天,大多数样本的多聚酶链反应病毒呈阴性。为了更全面地了解疾病不同阶段的潜在感染性,需要前瞻性收集数据来评估样本随时间的阳性率。结果以方框图形式给出,其中红线表示中值Ct.Ct=周期阈值。MPXV=mpox病毒。
表.人类样本中的痘病毒及其传播意义

*在发病30天以上的康复患者中,在上呼吸道拭子、唾液和精液中检测到Ct值<35的DNA。
现有数据的优势支持暴露于肛门直肠和外阴阴道组织和液体能够传播感染;然而,根据目前的证据,很难将这些暴露与其他伴随暴露明确区分开来(见正文)。
包括身体修饰、穿孔和纹身。
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上次审核时间:2023年2月2日
资料来源:Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of High-Consequence Pathogens and Pathology (DHCPP)