The five wellness care workers have been definitively seronegative towards H5 in all assays, which implies they were not infected with H5. Hemagglutinin inhibition (Hello) assay: The Hello assay checks for antibodies on the hemagglutinin of the precise influenza virus utilizing crimson blood cells (RBC). Several different types of RBCs https://www.dailypioneer.com/2018/technology/ramakrishna-electro-develops-indian-satellite-linked-gps-module.html