The 5 wellness care personnel have been definitively seronegative from H5 in all assays, which means they weren't infected with H5. This examine shows a craze of weakening binding affinity of existing antibodies towards H5 isolates with time, indicating that the H5N1 virus is evolving immune escape of our healthcare https://www.dailypioneer.com/2014/state-editions/fates-of-patiala-and-talwandi-sabo-sealed.html