Furthermore, SNPs in Toll-like receptors (TLRs), including rs4986790*TLR4, rs1898830*TLR2, rs7656411*TLR2, rs352162*TLR9, and rs187084*TLR9 as well as rs2280788*CCL5 were associated with severity of bronchiolitis [58,59]. This evidence concerns the gene TLR2 and bronchiolitis.