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Survival rates of PMN-depleted and control mice infected with a small (1.0 × 102 PFU) (A) or a large (1.5 × 103 PFU) (B) inoculum of influenza A virus strain PR8 and receiving passive transfer of anti-PR8 antiserum or NMS (or neither) 3 days (3d) after infection. BALB/c mice (8 to 10/group) were daily injected i.p. with MAb RB6 or control rat IgG from day −2 to day 8 after virus infection. Mice were intranasally (i.n.) infected with either inoculum of PR8 on day zero.
