Table 1.
NAI titres from the indicated reassortant viruses and antisera.
| α-N1-BR18 | α-N1-GD19 | α-N2-HK19e | α-N2-HK19c | |
|---|---|---|---|---|
| WSNH1N1/BR18 | 833 | n.d. | n.d. | n.d. |
| PR8H1N1/BR18 | 812 | n.d. | n.d. | n.d. |
| PR8N1/GD19 | n.d. | 4443 | <10 | 14 |
| PR8N2/HK19e | n.d. | <10 | 140 | 133 |
| PR8N2/HK19c | n.d. | <10 | 85 | 310 |
NAI titres represent the mean IC50 for each ferret antiserum (italics) against the indicated viruses that were determined from an ELLA performed in duplicate. Titres from reassortant viruses carrying a NA that matches the sequence of the NA used to generate the ferret antiserum are in bold. NAI titres that could not be measured are listed as less than the lowest reciprocal serum dilution. Source data are provided in the source data file (Figs. 2e and 3b).
n.d. not done.