The probability of human-to-human transmission of H5N1 is “really very low,” Chowdhury suggests. But if it had been to occur inside of a sustained method, it could rock the world in a way not observed since the 1918 Spanish Flu. Hemagglutinin inhibition (Hello) assay: The HI assay checks for antibodies https://www.dailypioneer.com/2022/india/india--australia-defence-ties-ensuring-free--open-indo-pacific-region--says-minister.html