Table 5.1 – Reported Cases & Estimated Infections – 95% CI

What to know

To account for underascertainment and underreporting, a previously published probabilistic model1 was used to estimate the true incidence (symptomatic and asymptomatic cases) of hepatitis A, acute hepatitis B, and acute hepatitis C from reported (symptomatic) cases.
2022 Hepatitis Surveillance Appendix

Number of reported cases* and estimated infections† of acute viral hepatitis with 95% bootstrap confidence intervals — United States, 2015–2022

Table 3.7. Number and rates* of deaths with hepatitis C listed as a cause of death† among residents, by state or jurisdiction — United States, 2018–2022
Table 5.1 Data
Number of reported cases* and estimated infections† of acute viral hepatitis with 95% bootstrap conf...
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Source: CDC, National Notifiable Diseases Surveillance System.

* Reported confirmed cases. For case definitions, visit Surveillance Case Definitions for Current and Historical Conditions.

† 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 underascertainment and underreporting.

Summary

To account for underascertainment and underreporting, a previously published probabilistic model1was used to estimate the true incidence (symptomatic and asymptomatic cases) of hepatitis A, acute hepatitis B, and acute hepatitis C from reported (symptomatic) cases.

The model includes the probabilities of symptoms, referral to care and treatment, and rates of reporting to local and state health departments. The published multipliers have since been corrected by CDC to indicate that each reported case of hepatitis A represents 2.0 estimated infections (95% bootstrap confidence interval [CI]: 1.4–2.2), each reported case of acute hepatitis B represents 6.5 estimated infections (95% CI: 3.7–15.9), and each reported case of acute hepatitis C represents 13.9 estimated infections (95% CI: 11.0–47.4). Work is underway to update the multipliers for hepatitis A, hepatitis B, and hepatitis C using updated literature.

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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.