If it seems like everybody you know has or has had the flu recently, you’re not too far wrong. The CDC confirms that flu activity is currently widespread in most of the U.S.
Flu viruses are constantly changing so it’s not unusual for new flu viruses to appear each year, which keeps the CDC busy trying to anticipate the types of vaccinations that will be needed and make sure they are in sufficient supply. The CDC reviews and updates the composition of vaccines to match – as much as possible – whatever flu viruses are circulating.