The five overall health care workers were definitively seronegative versus H5 in all assays, meaning they were not infected with H5. Hemagglutinin inhibition (HI) assay: The Hello assay tests for antibodies to your hemagglutinin of the precise influenza virus working with red blood cells (RBC). Several different types of RBCs https://www.dailypioneer.com/2025/trending-news/kerala-set-for-historic-ranji-trophy-final-after-dramatic-two-run-lead-over-gujarat.html