One anti-sceptic is DonaldHenderson, director of the Centre for Civilian Biodefence Studies at Johns Hopkins University, who believes that the threat of bioterrorism has increased in recent years.
Michael Osterholm, of the University of Minnesota, and DonaldHenderson, of the University of Pittsburgh, however, argue in Science that H5N1's human-fatality rate means any benefits that might flow from the research are dwarfed by the risks.