According to the study "Diagnostic Efficacy of Serological Antibody Detection Tests for Hepatitis Delta Virus: A Systematic Review and Meta-Analysis" by Pan et. al (2023), the Researchers stated that "According to a recent meta-analysis, an estimated 12 million people worldwide have
been infected with HDV. However, due to large gaps in diagnosis, especially in
high-prevalence areas and populations, this number might be underestimated, which is
supported by meta-analyses indicating that 50–72 million HBV carriers may be coinfected
with HDV". I am curious about how do the diagnostic accuracies of serological antibody detection tests for hepatitis delta virus differ from various populations and settings.