Figure 1.

Differential induction of AHR in Line A2 and 19 A strain viruses. Six-week-old BALB/c mice were infected with 1 × 10⁵ PFU of a specific RSV strain of virus and assessed for AHR at days 6 or 9 of infection by box plethysmography in anesthetized, ventilated animals. Peak airway resistance was recorded after an intravenous tail vein administration of methacholine (250 μg/kg). Data represent mean ± SE from five to six mice per group. *P < 0.05.