Diagnosing patients with chronic hepatitis B virus (HBV) infection and establishing linkage to treatment is important in achieving the World Health Organization (WHO) objectives in eliminating HBV as a public health threat by 2030. Global HBV diagnosis rates and treatment rates among eligible patients were 10% and 5% respectively. In Mainland China and Hong Kong, estimated diagnosis and treatment coverage were 19-27% and 11-22% respectively, similarly much lower than the WHO 2030 goals of 90% for diagnosis and 80% for treatment. A recent modeling study demonstrated that even if a modest 50% diagnosis rate was achieved in China, this will result in a 19% mortality decline, with 2.1 million deaths averted. Currently, HBV screening is recommended for persons born in regions with a HBV prevalence of 22%. This includes the vast majority of East Asian countries.
In the HBV care continuum, identifying patients and arranging linkage to care is only the first step. Long-term retention of patients is critical, especially since with disease progression, treatment eligibility rates can increase by 30% after 3 years of follow-up. Nonetheless, there has been a paucity of data on HBV care continuum retention rates after referrai and linkage. A US-based study did found that among diagnosed patients, only 63.2% achieved linkage to referral, and only 44.1% remained retained in clinical care after at least three clinic visits. Another study in Italy found a higher retention of 60% after 5 years; besides African ethnicity and concomitant HIV infection, the study failed to identify any predictors of retention failure, yet 74.8% of retained patients subsequently required treatment. There has been otherwise no published data on linkage to retention rates in endemic regions including East Asia, and on whether the care continuum cascade can successfully link referral to treatment.
Our center previously conducted a territory-wide prevalence study of HBV, and out of \>10,000 screened participants, the investigators identified 803 hepatitis B surface antigen (HBSAg)-positive individuals, with a mean age of 53.7 (135.8) years (36.7% male). As part of linkage to care, all patients were subsequently referred to their respective geographical cluster hospital. The investigators recently performed a follow-up telephone survey of the 803 patients, asking on their status of clinical follow-up and liver-related treatment. Our preliminary data found a retention rate of only 37.1% after 2 years post-referral. However, among retained patients, 51.2% were already started on anti-HBV treatment, suggesting that high rates of treatment eligibility may also exist in unretained patients. Hence, to enhance linkage to treatment, linkage to retention rates will need improvement.
There is emerging evidence on the effect of different interventions in improving the care continuum of viral hepatitis, although the majority of evidence is concentrated in hepatitis C virus and not HBV. Clinical reminders have been demonstrated to be the most effective method to improve testing rates; such reminders may also be useful to in improving clinic attendance and retention. On the other hand, the data on educational materials is less consistent. Data was concentrated in Asian migrants in North America, with some based on non-randomized studies, and could be susceptible to selection, attrition and reporting bias.
Interventions using social media and mobile technology may be promising. Experience from engaging patients with human immunodeficiency virus infection have found social media effective in reaching out to marginalized individuals, especially among those of a younger age. It would be interesting to see if educational videos disseminated on mobile devices via social media can improve linkage to retention and treatment for HBV.
