How many people get H1N1 in a year?

According to data from the World Health Organization, there are an estimated 1 billion cases of seasonal influenza virus infections globally each year. Of those, it is estimated that approximately 3 to 5 million cases result in severe illness, and about 290,000 to 650,000 people die from respiratory complications related to influenza. The exact number of people who get H1N1 influenza in a year will depend on the severity of the flu season and the population affected, as well as the region of the world, as H1N1 is one of the strains that circulate annually during influenza seasons.