It was a quiet summer for bird flu: Egg prices fell a bit, fewer sick poultry flocks were culled on farms, and officials took a breath. “It was lovely,” said Shauna Voss, the assistant director of the Minnesota Board of Animal Health. But it didn’t last. Bird flu is spreading again, now that wild water fowl — geese, ducks and cranes — have begun their seasonal migrations. As the birds travel, they

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