Winter is almost here, and that means there will likely be an increase in people getting the flu. Indeed, you may have already gotten your yearly flu shot in preparation for the season. But why is flu season in winter anyway?
In the United States, flu activity typically picks up in the fall, and peaks between December and February, according to the Centers for Disease Control and Prevention. However, flu season is unpredictable, and can start as early as October, and continue as late as May.