儿童A族链球菌感染中毒性休克综合征的研究进展

王红玉 ,  周维 ,  黄丽素

中国当代儿科杂志 ›› 2026, Vol. 28 ›› Issue (01) : 120 -127.

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中国当代儿科杂志 ›› 2026, Vol. 28 ›› Issue (01) : 120 -127. DOI: 10.7499/j.issn.1008-8830.2503136
综述

儿童A族链球菌感染中毒性休克综合征的研究进展

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Research progress on toxic shock syndrome due to group A Streptococcus infection in children

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摘要

儿童链球菌中毒性休克综合征是一种由链球菌感染引发的严重并发症,临床表现以急性休克和多器官功能障碍为主要特征。该病病情危重、病死率高,早期诊断和治疗是改善预后的关键。儿童群体患病后致死风险更高,且其发病机制复杂。该文旨在综述儿童A群链球菌感染所致链球菌中毒休克综合征的发病机制及诊疗进展,以期为改善临床预后、降低病死率提供参考。

Abstract

Streptococcal toxic shock syndrome in children is a severe complication of group A Streptococcus infection, characterized by acute shock and multiple organ dysfunction. It is a critical illness with high mortality, and early diagnosis and treatment are key to improving prognosis. Children with this syndrome have a higher risk of death, and the pathogenesis is complex. This review summarizes the pathogenesis and recent advances in the diagnosis and treatment of streptococcal toxic shock syndrome caused by group A Streptococcus infection in children, aiming to improve clinical outcomes and reduce mortality.

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关键词

链球菌中毒性休克综合征 / A族链球菌 / 治疗 / 儿童

Key words

Streptococcal toxic shock syndrome / Group A Streptococcus / Treatment / Child

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王红玉,周维,黄丽素. 儿童A族链球菌感染中毒性休克综合征的研究进展[J]. 中国当代儿科杂志, 2026, 28(01): 120-127 DOI:10.7499/j.issn.1008-8830.2503136

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链球菌中毒性休克综合征(streptococcal toxic shock syndrome, STSS)是一种急性、严重的毒素介导性疾病。STSS的病因主要涉及细菌入侵、毒素释放及宿主免疫反应异常。链球菌释放的毒素可过度激活宿主免疫系统,引发“细胞因子风暴”,进而导致多器官功能障碍和休克。STSS通常由A族链球菌(group A Streptococcus, GAS)引起,但也可能由其他组溶血链球菌导致。近年来,由B族链球菌和G族链球菌致病的报道也日益增多1-4。本文针对GAS所致STSS的最新研究进展作一综述。

1 发病率及死亡率

STSS的发病率相对较低,但其致死率高达30%~70%5。儿童GAS侵袭性感染的发病率约为每年1~3例/10万人,1岁以下婴儿的发病率甚至更高,每年3~5例/10万人6。在儿童侵袭性GAS感染病例中,5%~15%会发展为STSS7。目前尚无针对链球菌的疫苗,因此抗生素治疗至关重要。尽管GAS的抗菌药物耐药性总体低于其他病原体,但其仍是全球范围内感染相关死亡的主要原因之一8

2 高危因素

儿童与成人发生GAS侵袭性感染的危险因素存在差异。儿童的常见危险因素包括水痘、上呼吸道感染(如咽扁桃体炎)、皮肤创伤、手术以及非甾体抗炎药的使用等9-10。一项针对成人的研究发现,侵袭性GAS感染的相关危险因素包括轻微创伤(如导致血肿、瘀斑、肌肉拉伤)、病毒感染(如流感、水痘)、使用非甾体抗炎药、近期手术、烧伤、肥胖、恶性肿瘤、免疫抑制(如使用皮质类固醇)、糖尿病、心脏疾病等11

3 发病机制

3.1 链球菌的分类及其致病性

链球菌是一类革兰氏阳性球菌,根据溶血特性和细胞壁抗原的不同,主要分为A、B、C、D、G等多个群体。其中,GAS是导致儿童STSS的主要病原体12。GAS拥有多种致病因子,包括M蛋白、透明质酸荚膜及多种外毒素,这些因子协同作用,可导致宿主免疫系统过度反应和组织损伤13。此外,链球菌还能通过产生超抗原(如链球菌毒素A)激活大量T细胞,诱发广泛免疫反应和细胞因子风暴,进一步加重病情并导致休克14。链球菌通过黏附、侵袭及免疫逃逸等机制,成功在宿主体内定植并引发严重感染。

3.2 链球菌毒素的作用机制

STSS的发病机制尚未完全明确,链球菌的致病性与其表面抗原、细胞外毒素及免疫逃逸机制密切相关(图115。链球菌产生的外毒素在STSS发病中起关键作用。化脓性链球菌的主要超抗原外毒素包括链球菌热原外毒素A、B、C及链球菌超抗原A16。此外,链球菌还分泌毒力因子以促进感染和逃避免疫系统清除,例如链球菌溶血毒素O和S可破坏宿主细胞,导致组织损伤和炎症反应17。细菌T细胞超抗原(superantigen, SAg)是一类微生物外毒素家族,可同时激活大量T细胞;其通过调控T细胞免疫反应,在STSS和猩红热等人类疾病中的核心作用已得到公认14。GAS产生的超抗原毒素A和C可绕过正常抗原呈递过程,非特异性激活大量T细胞,诱发细胞因子风暴(如炎性小体、白细胞介素-1β、肿瘤坏死因子-α等),从而导致严重的多器官衰竭18-20。此外,GAS分泌的因子通过Gasdermin激活直接诱导皮肤坏死,并借助复杂的免疫逃避策略维持在人体血液中的存活和复制19。M蛋白作为化脓性链球菌的重要毒力因子,亦是多种候选疫苗的靶抗原21。上述毒素的协同作用是STSS发病的关键机制。

3.3 免疫逃避机制

GAS引发疾病的能力取决于其破坏宿主防御、逃避免疫监视的能力。GAS已进化出多种机制靶向宿主免疫球蛋白G的结构和功能,以规避抗体介导的免疫反应22。GAS可侵入上皮细胞、内皮细胞及吞噬细胞,同时逃避免疫系统的先天免疫应答,包括吞噬作用、选择性自噬、轻链3相关吞噬作用及炎症反应等23。M蛋白在GAS的免疫逃避策略中至关重要,主要通过两种关键机制抑制补体系统功能。研究发现,GAS还可通过表面相关S蛋白捕获红细胞片段,该机制通过将GAS调理素靶标隐藏于天然宿主细胞成分中帮助GAS生存,从而有效地将细菌与宿主免疫系统分开。S蛋白的存在对维持GAS毒力至关重要,其缺失会导致毒力降低,并影响针对病原体的免疫记忆的形成24

4 临床表现

STSS的临床表现复杂且严重,通常包括急性发热、低血压、皮疹及多脏器功能障碍7。典型症状包括突发高热、寒战、恶心、呕吐、腹泻及肌肉疼痛。皮疹多为弥漫性红斑,与猩红热皮疹相似,通常在1~2周后可能出现脱皮。一项回顾性研究发现,约48%的患者无皮疹表现,约40%的患者存在精神状态改变25。此外,患者还可能出现意识模糊、昏迷、休克等严重症状。临床上,医生需高度警惕上述症状,尤其对于既往健康的儿童突发此类表现时。当患儿出现发热、快速进展的休克、意识改变,且伴有软组织感染时,应考虑STSS的可能性。早期识别和干预对降低病死率至关重要。新生儿和年幼婴儿感染后的早期表现往往不典型,这类患儿可能发热或体温正常;因此,需警惕体温过低或体温正常的年幼婴儿和儿童感染进展为STSS26。GAS感染最常见的侵入途径为皮肤、阴道及咽部黏膜。轻微创伤是引起STSS的常见原因,在皮肤感染的情况下,既往损伤或受伤区域可成为GAS穿透真皮屏障的通道,患者局部出现红肿、瘀斑及皮肤坏死,1~3 d内可能发生深部感染27。STSS还需与其他休克综合征进行鉴别,见图228

5 实验室检查与影像学评估

实验室检查在儿童链球菌感染STSS的诊断中具有关键作用。目前,GAS感染的诊断主要依据细菌培养,但该方法耗时较长;对于急性GAS感染,病原学诊断还可采用核酸检测、快速抗原检测。常规血液检查可能显示白细胞增多或减少、血小板减少及肝功能异常。日本一项全国性观察研究发现,白细胞计数<4×109/L和肌酸激酶≥300 U/L是预测STSS的相关生物标志物29。C反应蛋白(C-reactive protein, CRP)和前降钙素原通常显著升高30,提示存在严重炎症反应。一项回顾性研究显示,STSS死亡患者CRP浓度与幸存者比较差异无统计学意义31,这提示CRP水平不能作为STSS患者的预后预测指标。Torimitsu等27对STSS死亡患者的尸检研究发现,所有患者的CRP均升高,而前降钙素原并未升高。影像学评估手段(如胸部X线、腹部超声)有助于评估STSS患者的多脏器受累情况,其中胸部X线可辅助识别肺炎等肺部受累表现,腹部超声可协助判断腹膜炎等腹腔脏器病变。当存在软组织感染时,磁共振检查的诊断价值可能优于CT检查。综合上述检查结果,有助于全面评估病情并制定针对性治疗策略。

6 诊断标准

STSS的诊断标准由美国疾病控制与预防中心于20世纪80年代提出,并于2011年修订。儿童链球菌感染STSS的诊断需结合临床表现和实验室检查结果,确诊病例需满足以下条件32-33。(1)从患者无菌部位分离出化脓性链球菌。(2)低血压(收缩压低于对应年龄的第5个百分位数)。(3)多器官受累,且符合以下2项或2项以上特征。①肾功能损害:血肌酐值≥对应年龄正常上限的2倍;若患者已有肾脏疾病,则较基线水平升高≥2倍;②凝血功能障碍:血小板≤100×109/L,或存在弥散性血管内凝血(定义为凝血时间延长、纤维蛋白原水平降低及纤维蛋白降解产物阳性);③肝脏受累:谷丙转氨酶、谷草转氨酶或总胆红素水平≥对应年龄正常上限的2倍;若患者已有肝脏疾病,则较基线水平升高≥2倍;④急性呼吸窘迫综合征;⑤红斑性黄斑皮疹(可能伴随脱屑);⑥软组织坏死(如坏死性筋膜炎、肌炎或坏疽);⑦神经系统症状:存在定向障碍或意识水平改变,且无局部神经症状(无发热和低血压时)。疑诊病例为从非无菌部位(如口咽、痰液、阴道、手术部位等)分离出GAS。目前STSS的诊断仍面临挑战,部分临床特征(如低血压)可能呈短暂性发作,而部分特征(如皮疹)可能缺失。由于STSS与脓毒性休克、侵袭性GAS疾病在临床表现上存在共性(如低血压伴多器官衰竭、无菌部位GAS培养阳性),临床常将STSS病例归入后2类疾病范畴。数据显示,STSS实际发病率可能为当前诊断数量的5.3倍34

7 STSS的治疗现状

7.1 支持性治疗

首先,必须及早发现疾病并立即启动复苏治疗。器官支持和对症治疗与其他脓毒性休克病例相似,必要时使用液体复苏、早期使用血管加压药、气管插管、机械通气、肾脏替代疗法。

7.2 杀菌抗生素治疗

抗生素治疗是STSS治疗的基础,常用药物包括青霉素、克林霉素和万古霉素。β-内酰胺类药物仍是GAS感染的一线治疗药物。一项研究显示,GAS菌株对青霉素、氨苄西林、利奈唑胺、万古霉素和替加环素的敏感性为100%35。另一项研究报道,头孢曲松和万古霉素对GAS的体外药敏敏感性分别为95.9%和91.8%36。但鉴于青霉素对GAS的敏感性普遍极高,且其临床疗效确切,因此,目前仍然推荐以青霉素为基础的方案用于治疗STSS37。儿童STSS病例对氨苄青霉素表现出高度敏感性,对克林霉素和红霉素表现出高度耐药性,故应避免使用大环内酯类药物。临床中常使用超广谱和特殊级抗生素,但研究表明其有效率低于含青霉素的治疗方案26

7.3 抗毒抗生素治疗

克林霉素和利奈唑胺等蛋白质合成抑制剂类抗生素,可通过抑制细菌蛋白质(包括外毒素)的合成,从而减少毒素产生。与青霉素相比,克林霉素具有更强的组织渗透性和更长的抗生素后效应,且能抑制侵袭性酶及外毒素合成,因此推荐将其作为β-内酰胺类抗生素的辅助治疗药物,以降低病死率38。近年来,克林霉素耐药率持续上升,使其可能不再作为首选辅助抗毒类抗生素。近期研究发现,链球菌对大环内酯类和克林霉素的耐药性已普遍存在,尤其是在亚洲39。2013—2022年的监测数据显示,美国10个州中的侵袭性GAS菌株中,对大环内酯类和克林霉素不敏感的分离株从2013年的12.7%升至2022年的33.1%40。克林霉素的耐药性主要由红霉素抗性甲基化酶基因介导的核糖体RNA甲基化和抗生素外排泵mef基因引起41-42。一项研究评估了不同抗生素组合治疗STSS的效果,结果显示,青霉素联合克林霉素及静脉注射免疫球蛋白可显著提高治疗成功率26。目前抗毒抗生素的最佳用药疗程尚未明确。利奈唑胺是极具潜力的替代辅助药物,其作用机制与克林霉素相似,且体外实验证实其可实现与克林霉素相近的GAS毒力因子衰减效果43。对于克林霉素耐药的GAS菌株,临床医生可以考虑使用利奈唑胺44-45

7.4 免疫治疗

近年来,静脉注射免疫球蛋白(intravenous immunoglobulin, IVIG)等免疫治疗在STSS治疗中的应用逐渐受到关注,部分专家推荐将IVIG作为STSS的辅助治疗手段,主要基于实验室数据显示其可能有益,包括中和超抗原和增强细菌清除46-47。尽管目前对此存在争议,但多数文献仍建议采用该方案。其可通过抗炎、免疫调节(如激活固有免疫、阻断SAg)发挥作用48,且能显著降低病死率与并发症的发生率49。然而,IVIG的最佳给药剂量与时机尚无充分数据支持,急性感染期给药剂量相关研究的匮乏也导致不同研究的给药剂量存在差异。在Darenberg等50的试验中,给药方案为第1天1 g/kg,第2天和第3天各0.5 g/kg;Kaul等51报道的最高给药剂量为2 g/kg。近期临床试验发现,在大多数情况下,25 g免疫球蛋白已足以实现对GAS超抗原活性的血浆中和,因此推荐IVIG给药方案为第1天0.5 g/kg体重(或至少25 g),之后每日25 g,持续1~2 d52

7.5 最新抗毒力策略

GAS中抗生素耐药性的日益流行,亟需改变现有治疗策略。对抗毒力剂的探索成为极具前景的研究方向,其通过靶向控制毒力因子表达的调节机制来对抗感染,可降低化脓性链球菌的毒力53。AR-12是一种吡唑衍生物,已有研究报道其可抑制病毒、细胞内细菌及真菌的感染。体外实验结果表明,AR-12能剂量依赖性地抑制GAS的生长5。在小鼠模型中应用链球菌溶血素O或M蛋白的单克隆抗体,可降低流感GAS混合感染的发病率,因此进一步开发靶向M蛋白或链球菌溶血素O的抗体,可能成为治疗侵袭性GAS疾病的有效辅助手段54

8 未解难题及未来方向

尽管在儿童链球菌感染所致STSS的研究领域已取得显著进展,但仍存在诸多未解难题。GAS感染造成的全球疾病负担很高,目前尚无获得许可的针对性疫苗。传统的培养方法存在诊断延迟的潜在问题,超抗原快速检测技术的临床转化亟待推进。随着抗生素耐药性的增加,亟需开发新型抗菌剂。为降低STSS的发病率和病死率,早期诊断和联合治疗(β-内酰胺类抗生素、克林霉素和静脉注射免疫球蛋白)必不可少55。目前STSS治疗药物的比较详见表155356

综上所述,未来的研究应进一步深入探讨其发病机制,开发更精准的诊断工具和有效的治疗方法。此外,开展多中心协作研究将有助于制定标准化的诊治指南,从而进一步改善临床预后并降低病死率。

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