The H5N9 strain of avian influenza is much more rare than the H5N1 which has been responsible for most of the reported human ...
A decade-old bird flu strain, H5N9, has surfaced in US poultry for the first time, detected in a California duck farm.
The H5N1 virus has a ways to go before it can successfully jump to humans but that it doesn’t reduce the threat it poses.