目的 探讨婴幼儿2019冠状病毒病（COVID-19）的临床特点及胸部CT表现。方法 收集并回顾性分析2020年1月20日至2月10日经核酸检测确诊为COVID-19的婴幼儿（0~3岁）患者的临床资料及胸部CT资料。结果 9例患儿均有流行病学史，呈家庭聚集性发病。9例患儿中无症状5例，发热4例，咳嗽2例，流涕1例，均无呼吸系统以外症状。9例患儿实验室检查均未见白细胞及淋巴细胞计数减少，其中6例淋巴细胞计数升高及2例白细胞计数升高。9例患儿中8例CT显示肺部炎症，病灶均位于胸膜下或叶间裂下，3例病灶同时沿支气管血管束分布；病灶形态以结节状（6例）及小斑片状（7例）为主；6例病灶呈磨玻璃影及实变影共存，其中3例可见"晕征"，未见典型"铺路石征"。结论 婴幼儿COVID-19患者临床症状轻，影像学表现不如成人典型，其诊断需结合流行病学史及核酸检测综合判断，胸部CT对于无症状患儿的早期诊断有指导意义。

Objective To study the clinical features and chest CT findings of coronavirus disease 2019 (COVID-19) in infants and young children. Methods A retrospective analysis was performed for the clinical data and chest CT images of 9 children, aged 0 to 3 years, who were diagnosed with COVID-19 by nucleic acid detection between January 20 and February 10, 2020. Results All 9 children had an epidemiological history, and family clustering was observed for all infected children. Among the 9 children with COVID-19, 5 had no symptoms, 4 had fever, 2 had cough, and 1 had rhinorrhea. There were only symptoms of the respiratory system. Laboratory examination showed no reductions in leukocyte or lymphocyte count. Among the 9 children, 6 had an increase in lymphocyte count and 2 had an increase in leukocyte count. CT examination showed that among the 9 children, 8 had pulmonary inflammation located below the pleura or near the interlobar fissure and 3 had lesions distributed along the bronchovascular bundles. As for the morphology of the lesions, 6 had nodular lesions and 7 had patchy lesions; ground glass opacity with consolidation was observed in 6 children, among whom 3 had halo sign, and there was no typical paving stone sign. Conclusions Infants and young children with COVID-19 tend to have mild clinical symptoms and imaging findings not as typical as those of adults, and therefore, the diagnosis of COVID-19 should be made based on imaging findings along with epidemiological history and nucleic acid detection. Chest CT has guiding significance for the early diagnosis of asymptomatic children.