By P.J. Huffstutter and Julie Steenhuysen CHICAGO (Reuters) – Hundreds of farm workers exposed to a highly pathogenic strain of bird flu have been offered antiviral medication as a preventative measure in recent days, U.S. public health officials said. To date, the virulent H5N2 influenza, which has infected turkeys and chickens on Midwestern poultry farms, has not affected humans. Dr. Alicia Fry, a medical officer in the Centers for Disease Control and Prevention’s influenza division, said that while health officials are cautiously optimistic that humans will not be affected, her agency has isolated a pure strain of the H5N2 virus for potential use in a human vaccine, should one be needed. Concerns about human health risk have prompted investigators to ramp up biosecurity measures on infected farms, with some government staff overseeing the culling of birds wearing full protective body suits and ventilators.
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