Itinai.com light and shadow chase in a bright clinical trial 46d6fec8 e34f 4900 920c bc826aa5cb79 2
Itinai.com light and shadow chase in a bright clinical trial 46d6fec8 e34f 4900 920c bc826aa5cb79 2

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

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