avian flu

Bird Flu Virus Raises Questions Scientists Working To Answer
Bird Flu Virus Raises Questions Scientists Working To Answer
DES MOINES, Iowa (AP) — It's been five months since the H5N2 bird flu virus was discovered in the U.S., and producers have lost more than 21 million birds in the Midwest alone. Yet, researchers with federal agencies acknowledge they still know little about the virus' origin and how it spreads, especially with heightened biosecurity measures at commercial poultry farms and the apparent lack of wide

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