Influenza (flu) season lasts from October through May in the United States, with peak flu activity between December and March. Since the start of the COVID-19 pandemic, the timing and duration of flu activity have been unpredictable. The U.S. Centers for Disease Control and Prevention (CDC) reported early increases in seasonal flu last year. The Southern Hemisphere also experienced an early surge of flu activity this year, which may indicate what’s to come in the United States.

Furthermore, health experts anticipate another wave of respiratory viral infections this fall, namely from the flu, the virus that causes COVID-19, and respiratory syncytial virus (RSV). Fortunately, vaccines for all three viruses will be available for the first time in the fall.