Figure 7.

Measles virus infection does not significantly alter BAL cellularity, and influenza infection primarily induces a macrophage response. BAL cytology of naïve animals was compared with that of cotton rats infected intranasally with 10⁵ TCID₅₀ measles virus (Bilthoven [MV]) or 10⁶ TCID₅₀ influenza A virus (Wuhan H3N2 [Flu]). BAL fluid was collected at 4 d after infection. Bars represent mean values (n = 4–8 cotton rats per group); error bar, 1 SD. Value differs significantly (§, adjusted P < 0.0001; Welch t tests, Holm–Sidak correction) from that for naïve cotton rats.