CRP > 37.1 mg/L was positively correlated with confirmed bacterial pneumonia and negatively associated with RSV pneumonia, and additionally, values > 11 mg/L have raised suspicion for bacterial co-infection in children with moderate to severe bronchiolitis, in which CRP might be a prognostic marker of disease severity, yet other data indicate that children with acute bronchiolitis can have elevated concentrations regardless of bacterial coinfection [909,910,911,912]. Here, CRP is linked to acute bronchiolitis.