TLR4 and respiratory syncytial virus bronchiolitis: However, in blood neutrophils the total TLR4 for term infants with RSV bronchiolitis was significantly less than for preterm infants with RSV bronchiolitis (0.51 (0.023) vs 0.70 (0.038), p = 0.036), and both were less than for control infants (1.0 (0.035), p = 0.005; fig 3B).