Earliest Start To Flu Season in Nearly a Decade

girl getting flu shot from doctor
Flu viruses replicate quicky, so the helpful antibodies you may have developed to a previous year's strain often can't attach to this year's viruses. In other words, viruses evolve and so must the vaccines.
(Image credit: CDC)

Flu season has officially started, according to the Centers for Disease Control and Prevention (CDC).

Flu activity around the country is high enough that health officials announced today (Dec. 3) the season is under way. It's the earliest start to the season since the 2003-2004 flu season, excluding the 2009 pandemic, said Dr. Thomas Frieden, director of the CDC.

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Rachael Rettner
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Rachael is a Live Science contributor, and was a former channel editor and senior writer for Live Science between 2010 and 2022. She has a master's degree in journalism from New York University's Science, Health and Environmental Reporting Program. She also holds a B.S. in molecular biology and an M.S. in biology from the University of California, San Diego. Her work has appeared in Scienceline, The Washington Post and Scientific American.