儿童呼吸道合胞病毒感染与川崎病的关联：来自流行病学、临床与免疫病理机制的证据

Respiratory Syncytial Virus Infection and Kawasaki Disease in Children: Evidence from Epidemiology, Clinical Observations, and Immunopathogenesis

摘要: 本综述从流行病学趋势、临床观察及免疫病理机制三个层面，系统整合当前关于呼吸道合胞病毒(RSV)感染与儿童川崎病(Kawasaki disease, KD)之间潜在关联的研究证据。多项时间序列研究显示，RSV的季节性流行常领先KD发病高峰约3~5周，而在COVID-19期间随着RSV活动显著下降，KD发病亦呈同步减少趋势，提示二者可能存在外源诱发关系。临床研究方面，部分KD患儿在发病前数天至数周出现明确RSV下呼吸道感染史，且KD患儿的RSV检出率高于一般发热儿童；数据库研究进一步提示RSV感染后短期内KD风险升高。机制研究表明，RSV能激活TLR3、TLR4、RIG-I等先天免疫受体，引发以IL-1β、IL-6和TNF-α为核心的炎症反应，并导致血管内皮激活，与KD血管炎的免疫病理特征高度一致，尤其在存在免疫调控基因易感性的儿童中更可能放大炎症反应。尽管上述证据支持RSV作为KD的可能触发因素，但当前研究仍受限于检测方法差异、暴露时间界定不精确及多病毒共流行背景，因果性关系尚不能确定。临床上，应关注RSV感染后持续发热或出现KD相关体征的患儿，以便早期识别与干预。未来需要前瞻性、多中心的整合研究，结合标准化病毒检测、宿主遗传易感性与免疫组学，以进一步阐明RSV在KD发病中的确切作用，并评估RSV预防策略是否可能间接影响KD的发生率。

Abstract: This narrative review synthesizes epidemiological, clinical, and immunopathogenic evidence regarding the potential association between respiratory syncytial virus (RSV) infection and Kawasaki disease (KD) in children. Multiple time-series analyses demonstrate that seasonal peaks of KD often follow RSV epidemics by approximately 3~5 weeks, and a notable decline in KD incidence was observed during the COVID-19 period when RSV circulation sharply decreased, suggesting a possible viral-triggered component. Clinically, a proportion of KD patients have documented RSV infection in the preceding days to weeks, and RSV detection rates are higher in KD cases than in febrile controls. Population-based datasets further indicate an increased short-term risk of KD within weeks following RSV infection. Mechanistic studies show that RSV activates innate immune pathways including TLR3, TLR4, and RIG-I, inducing robust production of IL-1β, IL-6, and TNF-α and triggering endothelial activation, key features central to KD vasculitis. These responses may be amplified in children carrying immunoregulatory susceptibility genes. Despite convergent evidence across multiple domains, limitations related to exposure misclassification, variability in viral detection, and concurrent circulation of other respiratory viruses prevent definitive causal inference. Clinicians should remain vigilant when persistent fever or KD-like features emerge after RSV infection. Future prospective, multi-center studies integrating standardized viral testing, genetic susceptibility profiling, and immune phenotyping will be essential to clarify the causal role of RSV and to determine whether RSV-prevention strategies may indirectly influence KD incidence.