Mice were i.v. or i.p. immunized with 5 µg TNP-Ficoll, 5 µg TNP-LPS (LGC Biosearch Technologies), 2.87 µg Pneumovax 23 (Merck), or 50 µg NP-OVA supplemented with alum (LGC Biosearch Technologies). Mice were also i.v. infected with 2 × 107 SP (CPS-14) or i.n. infected with 100 PFU mouse-adapted human influenza virus A/PR/8/34 (PR8). In some experiments, SP was treated with mitomycin to inhibit bacterial proliferation. Lung tissue was processed to determine viral titers by plaque-forming assays.
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