Poultry vaccines combine to form 2 potent new virus strains

07/12/2012 | ScienceDaily

According to Australian researchers, two new infectious laryngotracheitis viruses have arisen from vaccines used to prevent the disease in chickens. The study, which compared the new viruses to two ILT vaccines widely used in Australia's poultry industry, found that the live portions of the vaccines recombined, forming the two new strains. The study supports the need for regulating the use of attenuated live vaccines across all species to protect against the formation of new viruses, researchers said.

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