FIG. 1.

Percent weight change (A), nasal tract and lung viral titers (B), and percent survival (C) in influenza virus-infected (Udorn) or mock-infected (PBS) mice that received type 3 pneumococcus on day 5 post-virus infection. Mice were weighed daily, and survival was recorded as a function of time postinfection. Viral loads were determined from nasal washes (nasal tract) and lung tissue homogenates harvested at different times post-virus infection and are expressed as TCID₅₀ per gram tissue or ml of nasal wash. Singly infected mice did not succumb to infection.