Prevalence and Incidence of Flu


About prevalence and incidence statistics: The term 'prevalence' of Flu usually refers to the estimated population of people who are managing Flu at any given time. The term 'incidence' of Flu refers to the annual diagnosis rate, or the number of new cases of Flu diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.

Incidence (annual) of Flu: 36 per 100 (NHIS96); 35 million annually up to 50 million annually (NIAID/CDC); 10-20% yearly (NIAID)
Incidence Rate: approx 1 in 3 or 36.00% or 97.9 million people in USA [about data]
Prevalance of Flu: Every year, 10 percent to 20 percent of Americans get sick with the flu (influenza).1 ... In the United States, approximately 25 percent of the population has flu-associated illness annually, leading to an average of 20,000 to 40,000 deaths per year.2 ... The U.S. Centers for Disease Control and Prevention (CDC) estimates that 35 to 50 million Americans come down with the flu during each flu season, which typically lasts from November to March.3

Incidence statistics about Flu: The following statistics relate to the incidence of Flu:

  • 3,665 confirmed cases influenza occurred in Australia 2002 (Yohannes K, Roche P, Blumer C et al. 2004, Australia’s Health 2004, AIHW)
  • 18.6 confirmed new cases per 100,000 population of influenza in Australia 2002 (Yohannes K, Roche P, Blumer C et al. 2004, Australia’s Health 2004, AIHW)

1. excerpt from Focus On The Flu: NIAID
2. excerpt from Microbes in Sickness and in Health - Publications, National Institute of Allergy and Infectious Diseases: NIAID
3. excerpt from The Flu, NIAID Fact Sheet: NIAID

Last revision: May 30, 2003

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