There is no suggestion that any of the strains are any more potent or infectious than another, infectious disease experts say.
Professor Paul Hunter, at the University of East Anglia, told MailOnline it is ‚entirely plausible‘ this could happen to one of the strains if it continues to evolve.
The report, made public today, was given to the Government‘s Scientific Advisory Group for Emergencies (Sage) in March to help them map the outbreak‘s spread.