Safe Pseudovirus-based Assay for Neutralization Antibodies against Influenza A(H7N9) Virus
Figure. . Correlation between conventional hemagluttination (HI) titer and 50% inhibitory concentration (IC50) titer of pseudovirus-based assay for diagnosing influenza A(H7N9) virus infection. Correlation between the IC50 titer of the pseudovirus-based neutralization assay and the titer of conventional HI assay, tested with 14 serum samples collected >10 days after symptom onset from patients with real-time RT-PCR–confirmed 2013 influenza A(H7N9) infection (○) and 50 control samples (△, Spearman r = 0.88, p<0.0001, n = 64). To display the information from all the samples, overlapped markers were shifted on the x- and/or y-axis with small incremental units.