TAT and hypersensitivity pneumonitis: Importantly, (i) mice/CR treated with AdV.C3-Tat/HIV-Luc alone (without inflammatory induction) showed low luciferase expression (Fig. 2B and C) and (ii) treatment of CR i.n. with either PBS (Fig. 3A) or with 107 PFU of AdV.C3-Tat/HIV-Luc for 1 day (Fig. 3B) or 3 days (Fig. 3C) failed to induce lung inflammation, in contrast to the strong alveolitis and interstitial pneumonia seen 3 days p.i. with A(H3N2) (Fig. 3D).