The flu virtually disappeared for two years as the pandemic raged. But influenza appears poised to stage a come-back this year in the U.S., threatening to cause a long-feared “twindemic.” The strongest indication that the flu could hit the U.S. this winter is what happened during the Southern Hemisphere’s winter. Flu returned to some countries, such as Australia, where the respiratory infection started ramping up months earlier than normal, and caused one of the worst flu seasons in recent years.
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