The Five overall health care workers were being definitively seronegative versus H5 in all assays, which implies they were not infected with H5. Hemagglutinin inhibition (Hello) assay: The Hello assay exams for antibodies into the hemagglutinin of the particular influenza virus using crimson blood cells (RBC). Multiple forms of RBCs https://www.dailypioneer.com/2019/technology/internet-connected-devices-put-kids-at-greater-risks.html