The five health and fitness care employees have been definitively seronegative from H5 in all assays, which means they were not infected with H5. Hemagglutinin inhibition (Hello) assay: The HI assay assessments for antibodies for the hemagglutinin of the specific influenza virus working with red blood cells (RBC). Various types https://www.dailypioneer.com/2018/state-editions/modi-govt-did-nothing-to-feel-ashamed-of-amit-shah.html