Respiratory Syncytial Virus-Associated Neurologic Complications in Children: A Systematic Review and Aggregated Case Series.

Saravanos, Gemma L; King, Catherine L; Deng, Lucy; Dinsmore, Nicole; Ramos, Isabelle; Takashima, Mari; Crawford, Nigel; Clark, Julia E; Dale, Russell C; Jones, Cheryl A; Wood, Nicholas J; Britton, Philip N

OBJECTIVES To describe the features and frequency of RSV-associated severe acute neurologic disease in children. STUDY DESIGN We performed a systematic review of the literature to identify reports of severe acute neurologic complications associated with acute respiratory syncytial virus (RSV) infection in children aged <15 years (PROSPERO Registration CRD42019125722). Main outcomes included neurologic, clinical, and demographic features of cases, and the frequency of disease. We aggregated available case data from the published literature and from the Australian Acute Childhood Encephalitis (ACE) study. RESULTS We identified 87 unique studies from 26 countries describing a spectrum of RSV-associated severe acute neurologic syndromes including proven encephalitis, acute encephalopathy, complex seizures, hyponatremic seizures, and immune-mediated disorders. The frequency of RSV infection in acute childhood encephalitis/encephalopathy was 1.2 to 6.5%. We aggregated data from 155 individual cases with RSV-associated severe acute neurologic complications; median age was 11.0 months (IQR 2.0-21.5), most were previously healthy (71/104, 68%). Seizure was the most frequently reported neurologic feature (127/150, 85%). RSV was detected in the central nervous system of 12 cases. Most children recovered (81/122, 66%), however some reports described partial recovery (33/122, 27%) and death (8/122, 7%). CONCLUSIONS RSV-associated neurologic complications have been widely reported but there is substantial heterogeneity in the design and quality of existing studies. The findings from our study have implications for the investigation, management, and prevention of RSV-associated neurologic complications. Further, this systematic review can inform the design of future studies aiming to quantify the burden of childhood RSV-associated neurologic disease.