"We are on optimum alert. We consider that this is the standard of epidemic that we must check in a most method," assured Mr. Kamba. Hemagglutinin inhibition (Hello) assay: The HI assay tests for antibodies towards the hemagglutinin of the particular influenza virus making use of pink blood cells (RBC). https://www.dailypioneer.com/2017/delhi/cong-bjp-sp-joined-hands-to-destroy-aap.html