Genetically Modifying Chickens to Beat Bird Flu: Neat Idea, But Will it Fly?
Controversial approach could outwit bird flu, researchers say.
Jan. 13, 2011— -- The idea of tweaking genes for healthier, tastier or more abundant food makes some people uneasy. But what if genetically modified food could help prevent the spread of a deadly disease, saving human and animal lives as well as money?
According to a study published in Science, genetically modified chickens could stop the bird flu virus -- specifically the highly pathogenic H5N1 strain -- in its tracks.
"The chickens can be infected, but they don't pass the virus on to other chickens in the flock," said study co-author Professor Helen Sang from The Roslin Institute at the University of Edinburgh.
Bird flu outbreaks in the U.S. are rare and involve viral strains that generally affect birds. But over 400 human cases of H5N1 have been reported in more than a dozen countries across Europe, Asia, Africa and the Pacific, according to the Centers for Disease Control and Prevention. Roughly 60 percent of these have been fatal.
Although there's no sign of H5N1 in the U.S., the country still feels the fury of bird flu. The virus is transmitted to chickens by wild birds, forcing farmers to slaughter entire flocks. So while it hasn't threatened public health, bird flu continues to fuel significant animal welfare worries and economic woes.
But given the logistical challenges of replacing current flocks with the flu-fighting variety -- not to mention mixed feelings about genetically modified food – the GM approach to beating bird flu may be hard to get off the ground.
"Replacing the world's chicken population with genetically modified chickens wouldn't be cheap. It looks good on a drawing board, but it might not fly," said William Schaffner, chair of preventative medicine at Vanderbilt University Medical Center. "There are lots of great ideas out there, but the filter of realty whittles them down pretty quickly."
But as poultry farming becomes more centralized, farmers are beginning to get their stock from a few, large suppliers, according to Sang.
"I think it would be very hard to get to the backyard chickens in many of the affected countries," Sang said. "But the majority of the poultry raised are coming from a small number of breading companies and producers who could choose to incorporate the genetic modification into their breeding program."
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