A scientist whose work was deemed too dangerous to publish by US biosecurity advisers revealed for the first time on Tuesday how he created a hybrid bird flu virus that is spread easily by coughs and sneezes. In a conference presentation that was webcasted live to the public, he has detailed how his team created the deadly virus.
Prof Yoshihiro Kawaoka at the University of Wisconsin-Madison described experiments that pinpointed four genetic mutations enabling the virus to spread between ferrets kept in neighbouring cages. The animals are considered the best models of how the infection might spread between people.
In December, the US National Science Advisory Board for Biosecurity (NSABB) called for key sections of Kawaoka’s work to be deleted from a paper in press at the British science journal Nature, amid fears that a rogue state or bioterrorist group might use the information to create a biological weapon.
The NSABB raised similar concerns over a paper by Dr Ron Fouchier at Erasmus Medical Centre in Rotterdam. That study, describing another mutant bird flu strain that can also be spread through the air between ferrets, is under consideration at the US journal Science.
The controversy over the papers triggered a rare crisis in science. Many researchers argued the work must be made fully public so it is available to other experts in the field, such as surveillance teams looking for emergent pandemic strains in Asia and elsewhere. Others said the work should never have been done, or that sensitive details should be shared only with a list of approved experts.
The advisory board reversed its stance on Friday after considering updated versions of the papers and a fresh risk analysis of the studies at a meeting at the National Institutes of Health in Washington DC. The board unanimously approved Kawaoka’s paper for publication in full, and gave the green light to Fouchier’s work after a vote of 12 to 6 in favour. Neither paper had information removed for the review.
Bird flu is considered particularly threatening to people because more than half of the 600 or so people known to have caught the virus have died from the infection. Many scientists fear the virus could trigger a devastating pandemic if it evolved into a form that spread rapidly from person to person.
The experiments by Kawaoka and Fouchier were designed to answer the crucial question of whether the bird flu virus could pick up genetic mutations in the wild that would allow it to adapt to humans and spread rapidly like seasonal flu.
Speaking at a Royal Society conference on bird flu which was webcasted, Kawaoka and Fouchier claimed their work highlighted how easily bird flu could mutate into a form that would potentially be transmissible among humans.
But their findings showed the mutant strains did not spread as swiftly as seasonal flu, and were not lethal to animals that caught the infection from a neighbouring animal. Both viruses could be controlled by antiviral drugs, such as Tamiflu, and bird flu vaccines, the researchers added.
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