Bird flu is surging again on US poultry operations this fall, leading to the culling of 7.3 million birds since early September. | Leon Neal/Getty Images It might now be a distant memory, but by the end of last winter, the average cost of a dozen eggs soared to a record high of $6.23. (It’s now at $3.49.) The cause was H5N1, a highly pathogenic strain of avian influenza — or bird flu — that wild birds shed near farms as they migrate for the winter. It’s now surging again in US poultry operations and could result in another winter of high egg prices — and tens of millions of dead birds...

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