Figure 1.1 - Hepatitis A: Number of Cases & Estimated Infections

Key points

During 2023, the number of reported cases of hepatitis A was 1,648, which corresponds to 3,300 estimated infections after adjusting for case underascertainment and underreporting.1
CDC 2023 Hepatitis A Surveillance Report

Number of reported cases* and estimated infections† of hepatitis A — United States, 2016–2023

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Source: CDC, National Notifiable Diseases Surveillance System.

* Reported confirmed cases. For the case definition, see National Notifiable Diseases Surveillance System Case Definitions.

† The number of estimated viral hepatitis infections was determined by multiplying the number of reported cases that met the classification criteria for a confirmed case by a factor that adjusted for under ascertainment and underreporting.1 The 95% bootstrap confidence intervals for the estimated number of infections are displayed in the Appendix.

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About Division of Viral Hepatitis
  1. Klevens RM, Liu S, Roberts H, et al. Estimating acute viral hepatitis infections from nationally reported cases. Am J Public Health 2014;104:482. PMC3953761.