CD79A and influenza: Beside classical ELISA‐based and NT assays specific anti‐HA influenza antibodies, there are newer assays with increased precision and sensitivity, such as the XMAP (x = analyte MAP = Multi‐analite profiling) technology adapted for Luminex‐based IgA assays.79, 80 The XMAP technology is a serological method that can be applied to measure multiple proteins or antibodies in a single‐well reaction with high accuracy and reproducibility.