Effectiveness of a hepatitis E vaccine against medically-attended symptomatic infection in HBsAg-positive adults from a test-negative design study

Effectiveness of Hepatitis E Vaccine in High-Risk Adults

Study Overview

This study looked at how well the hepatitis E vaccine works in adults who have chronic hepatitis B (CHB). We focused on individuals who tested positive for hepatitis B surface antigen (HBsAg).

Key Findings

We analyzed data from 2,926 HBsAg-positive adults, aged 49 on average, from a hepatitis surveillance system in Jiangsu, China, between 2007 and 2017. The study compared 96 confirmed hepatitis E cases with 2,830 controls who did not have the disease.

The results showed that the HEV 239 vaccine significantly reduced the risk of hepatitis E in HBsAg-positive individuals, with an effectiveness rate of:

  • 72.1% (95% confidence interval: 11.2-91.2)
  • 81.5% (95% confidence interval: 35.9-94.6) among phase 3 trial participants.

This indicates that the HEV 239 vaccine is very effective for adults with HBsAg, supporting its recommendation for use in this group.

Importance of Clinical Trials

Clinical trials are essential for developing safe and effective treatments. They help translate research into practical medical solutions.

Practical Solutions for Healthcare Providers

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