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Airway hyperreactivity in C57BL6 (H-2b) and BALB/c (H-2d) strains of mice after RSV infection. Change in airway resistance between baseline values and after challenge with 0.4 mg/kg methacholine intravenously measured by plethysmography, n = 10 per strain for each time point (Resistance units = cm H2O/ml/sec). Values represent means ± SEM; experiment was repeated three times with similar results obtained for each. * Significant changes (P < 0.05) in airway hyperreactivity.
