Table 1. Amino acid combinations of the VP2 capsid protein of the different virus strains used to generate the different inactivated vaccines used in the study.
| Virus strains | VP2 amino acid residues | ||
| 217 | 221 | 247 | |
| rNVI-15TAa | T | A | T |
| rNVI-15TTb | T | T | T |
| rNVI-15PA | P | A | A |
| rNVI-15PT | P | T | A |
a
The virus strains have a first letter r- to indicate recombinant strains were generated by reverse genetics. bVaccine strain rNVI-15TT was generated by serial passage of rNVI-15TA and rNVI-15PT was similarly generated through passage of rNVI-15PA, both on CHSE-214 cells (see Materials and Methods for details).