TLR5 and respiratory syncytial virus bronchiolitis: So far, there has been only one study on TLR5 in infant bronchiolitis, where TLR5 rs5744174, the same SNP as in the present study, did not have any significant effect on the risk of RSV bronchiolitis.22 In stratified analyses, however, preliminary evidence was found that the influence may be divergent in term and preterm infants with bronchiolitis.