Demonstrating a correlation between the wild-type C allele and increased susceptibility to bronchiolitis, we can speculate an important role of MARCO in the pathogenesis of airway infection, but our results about RSV disease severity differ from those of High et al. suggesting that the C allele increases the risk of bronchiolitis but in a mild presentation, whereas G allele is associated with severe clinical form of the disease. This evidence concerns the gene MARCO and bronchiolitis.