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    Two-wave US flu season is now the longest in a decade

    NEW YORK — Three months ago, this flu season was shaping up to be short and mild in the United States. But a surprising second viral wave has made it the longest in 10 years.

    This flu season has been officially going for 21 weeks, according to the Centers for Disease Control and Prevention. That makes it among the longest seen since the government started tracking flu season duration more than 20 years ago.

    Some experts likened the double waves to having two flu seasons compressed, back-to-back, into one.

    Associated Press