Characterization of Neuraminidases from the Highly Pathogenic Avian H5N1 and 2009 Pandemic H1N1 Influenza A Viruses
Figure 4
NA and hemagglutination activities of pseudoparticles.
(A) NA assay. Pseudoparticles were normalized for RNA copy number and analyzed for NA activity using a chemiluminescent substrate (n = 4). (B) Hemagglutination assay. Pseudoparticles were serially diluted 1:2 in a 96-well plate. Hemagglutination activity is expressed as the mean HA titer (log2 HA units/50 µl) of each pseudoparticle (n = 4).