The flu season is officially underway and, while an unexpected virus is taking center stage, treatments have been a good match so far for this year’s circulating viruses.

According to the Centers for Disease Control and Prevention (CDC), all regions of the country are now seeing flu activity—typical as the flu season typically peaks between December and March—with the highest level of activity occurring in the southern part of the country. What’s not typical, however, is the predominant circulating virus. CDC reports that most flu activity so far has been caused by Influenza B/Victoria viruses, which typically make an appearance later in the season. However, Influenza A (H1N1) is increasing in proportion in some regions, CDC notes.

“Nationally, flu activity has been elevated … and continues to increase; this represents somewhat of an early start to the U.S. flu season,” said Scott Pauley, a press officer for CDC. “Flu activity is currently being caused mostly by influenza B/Victoria viruses, followed by H1N1 viruses and H3N2 viruses. It is unusual for there to be this much influenza B activity at this time of year.”

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