The danger may not be the particular strain of Bird Flu (H5N1) but the virus's ability to change allowing it to more easily transmit between animals and humans. The Covid virus has gone through many different genetic changes that are of enough significance to lead virologists to label them separately. The possibility the Bird Flu will mutate into more virulent or easily communicable forms of the virus is the driver behind the market moves and the reason cattle futures are the target for speculation. The fear is a virus moving from animal to human and finding a human already active with a normal flu virus and having the two virus comingle and combine to create a new human transmissible virus.