Figure 4
Stability of influenza infectivity at 4 C in different matrices at different spiking concentrations. 10 μl of 3.55 × 106 EID50 of H1N1 virus (A), or 10 μl of 3.55 × 105 EID50 of H1N1 virus (B) diluted as stated in Materials and Methods was mixed with 130 μl of PBS, plasma, or buffy coats for different periods of time indicated. EID50 assay were performed and data were shown as log 10 (EID50)/ml.