Indeed, flu viruses do react to selection pressures, but we deal with it by making a new vaccine each year: http://en.wikipedia.org/wiki/Antigenic_drift http://

Indeed, flu viruses do react to selection pressures, but we deal with it by making a new vaccine each year: http://en.wikipedia.org/wiki/Antigenic_drift http://en.wikipedia.org/wiki/Antigenic_drift Which is not to say that we could not benefit from further research into the process.