Figure 1: Cytopathic effects (CPE) induced by influenza virus in human Lymphocytes and MDCK cells. Cells were inoculated with 4 HA units of influenza H1N2, H5/H7 (mixture) or H9N2, and incubated for 24 h at 37°C in 5% CO2 as described in Materials & Methods. A representative example of virus induced CPE with each virus isolate is shown. Each image is representative of the CPE induced by each virus observed in triplicate in two separate experiments.