The United States Government has taken the unprecedented step of asking scientists to censor key parts of their work describing how they managed to mutate the H5N1 bird flu virus into a strain that could be highly infectious.
Officials have become so alarmed at the prospect of the information falling into the hands of terrorists that they have asked for critical details of the experiments to be deleted before publication.
Two groups of scientists, in the Netherlands and the US, have submitted scientific papers describing how they managed to convert the virus, which does not spread easily between people, into an airborne form that can be transmitted in coughs and sneezes.
In a statement released yesterday, the US National Institutes of Health, which funded the research, says there are concerns that the virus could evolve naturally into a form that is transmissible between humans, which could result in a devastating pandemic.
"While the public health benefits of such research can be important, certain information obtained through such studies has the potential to be misused for harmful purposes," the statement says. "These manuscripts ... concluded that the H5N1 virus has greater potential than previously believed to gain a dangerous capacity to be transmitted among mammals, including perhaps humans."