The 5 health care staff have been definitively seronegative from H5 in all assays, which suggests they weren't infected with H5. Hemagglutinin inhibition (HI) assay: The HI assay assessments for antibodies on the hemagglutinin of the precise influenza virus employing purple blood cells (RBC). Numerous varieties of RBCs have been https://www.dailypioneer.com/2019/columnists/animals-are-born-free--let-them-live-free.html