It seems unlikely that this reduction in asthma-like features is due entirely to a switch from Th2 to Th1 responses because we did not observe increased airway IFN-γ in mice sensitized using 10–1 μg LPS and because, for doses up to 10–1 μg, increasing concentrations of LPS led to stronger Th2 responses in draining LNs. Here, IFNG is linked to asthma.