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Interferon induction and inhibition in a human cell line. (A) Type I interferon induction in A549 cells after infection with rL and rL-RVG. The inhibition units (IhU) were defined as the final dilution to give 50% inhibition of infection. (B) The levels of sensitivity of rL and rL-RVG to type I interferon in A549 cells. The minimal IhUs to inhibit 50% infection of rL and rL-RVG were determined in A549 cells. The data shown are the means plus SD of five independent experiments.
