The 5 overall health treatment staff were being definitively seronegative from H5 in all assays, which implies they weren't contaminated with H5. Hemagglutinin inhibition (Hello) assay: The Hello assay exams for antibodies for the hemagglutinin of the particular influenza virus employing crimson blood cells (RBC). Various different types of RBCs https://www.dailypioneer.com/2016/columnists/kf-rustamji-indias-iconic-police-officer.html