XK and influenza: Since the onset of the A(H5N1) outbreak in dairy cattle in early 2024, we updated the MIADA assay to a high throughput 28-plex with an expanded antigen cocktail including HA and NA of the virus isolated from 2.3.4.4b HPAI A(H5N1) A/Texas/37/2024 for antibody landscape analysis (antigens shown in Supplementary Table S1), and assessed recent sera collected in the 2023-24 influenza season (327 sera collected from 234 participants aged 0.5-77 yrs) (Table 1).