Three months ago, this flu season was shaping up to be short and mild in the U.S. 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 reports collected through last week and released Friday by 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 unusual double waves to having two different flu seasons compressed, back-to-back, into one.

“I don’t remember a season like this,” said Dr. Arnold Monto, a University of Michigan researcher who had been studying respiratory illnesses for more than 50 years.

The previous longest recent flu season was 20 weeks, which occurred in 2014-2015.

Flu can cause a miserable, relatively mild illness in many people and a more severe illness in others. Young children and the elderly are at greatest risk from flu and its complications. Flu vaccinations are recommended annually for all but the very young.

The current season began the week of Thanksgiving, a typical start time. At the beginning, most illnesses were caused by a flu strain that tends not to cause as many hospitalizations and which is more easily controlled by vaccines.

But in mid-February, a nastier strain started causing more illnesses and driving up hospitalizations.

Not helping matters: The harsher bug is not well matched to the vaccine, said the CDC’s Lynnette Brammer, who oversees flu tracking.

Still, this flu season is not nearly as bad as last winter’s 19-week season, the deadliest in at least four decades. An estimated 80,000 Americans died of flu and its complications last season.

The CDC is estimating that flu-related deaths this season in the range of 35,000 to 55,000.

More good news: Brammer said that although the virus is notoriously unpredictable, signs suggest this flu season should be over soon.

“It’s on the verge” of being over, she said. “If nothing changes.”

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Dina Amelia Kalmeta is the Founder and CEO of Your New Life in Christ Ministries - CWW7NEWS. Dina reports on world events as they pertain to Bible Prophecy. Before Your New Life in Christ Ministries, Dina served as a Leader for INCHRIST NETWORK leading teams online and spreading the Gospel of Jesus Christ. Her mission today is to bring hard evidence that what is taking place in the world isn't just coincidence, but indeed proof that the last days the Bible warned us about are upon us right now.