It is highly unlikely that all of the high-virulence alleles will simultaneously mutate and disappear if and when the haemagglutinin gene changes so as to make the haemagglutinin molecule better adapted for the human-type ( alpha-2, 6-linked ) receptor ( which is a necessary prerequisite in order that a pandemic with H5N1 virus may start ).
22.
It is highly unlikely that all of the high-virulence alleles will simultaneously mutate and disappear if and when the haemagglutinin gene changes so as to make the haemagglutinin molecule better adapted for the human-type ( alpha-2, 6-linked ) receptor ( which is a necessary prerequisite in order that a pandemic with H5N1 virus may start ).
