Reliable analytical tools are valuable for economical process development, production, and batch release of vaccines. The current method recommended by the European Pharmacopoeia and WHO for determination of influenza virus titer ¬ single radial immunodiffusion assay (SRID) is straightforward and easy, but leaves plenty of room for improvement when it comes to assay variability and speed of analysis. In addition to having low sensitivity and precision, the method is both time-consuming and quite labor-intensive. In this study a Biacoreâ„¢ assay…