Viral respiratory infections in children and metabolomics: a review of literature

Acute respiratory infections (ARIs) are the most common infectious diseases during childhood, responsible for significant morbidity and mortality in the pediatric population worldwide. Metabolomics, the global analysis of small metabolites, is a novel tool that offers insights into diagnostics and prognostics of viral respiratory infections. This review summarizes the existing literature on metabolomic studies in viral acute respiratory infections (ARIs) within the pediatric population. Metabolomic research on patients with bronchiolitis has addressed several clinical questions, such as discrimination by causative agent, i.e. respiratory syncytial virus or rhinovirus, and most importantly prognosis, predicting disease severity and long-term outcomes. In pneumonia, studies have focused on discriminating viral from bacterial etiology and from healthy controls but also predicting disease severity. There is a growing number of studies on metabolomics in ARIs providing a strong foundation for addressing remaining challenges and allowing for more comparable results and greater impact on clinical practice.