The aim of the present study was to complement this exploratory study series by evaluating whether the TLR7 rs179008, TLR8 rs2407992, TLR9 rs187084 and TLR10 rs4129009 polymorphisms are associated with the presence, clinical characteristics and viral etiology of bronchiolitis in early infancy. The gene discussed is TLR9; the disease is bronchiolitis.