Figure 1.4 – Case Rates by Age Group

At a glance

In 2022, the rate of reported cases of hepatitis A decreased in all age groups compared to 2021. In 2022, the highest rate occurred among persons aged 30–39 years (1.5 per 100,000 population)."
2022 Hepatitis A Surveillance

Rates* of reported cases of hepatitis A, by age group — United States, 2007–2022

Source: CDC, National Notifiable Diseases Surveillance System.

* Rates per 100,000 population. Beginning in 2021, single-race population estimates are used for rate calculations. For prior years, bridged-race population estimates are used.

† Reported confirmed cases. For the case definition, see Acute Hepatitis A.

Summary

Since 2007, the rates of hepatitis A decreased in all age groups and remained constant until outbreaks of hepatitis A began to be reported during 2016. The substantial increase in the rates of hepatitis A observed during 2017–2019 was apparent in almost all age groups. The exception was for persons aged less than 20 years, which is due to the introduction of hepatitis A vaccine in 1996 and universal childhood vaccination recommendation in 2006.

In 2022, the rate of reported cases of hepatitis A decreased in all age groups compared to 2021. In 2022, the highest rate occurred among persons aged 30–39 years (1.5 per 100,000 population).