LONDON – Conflicting data from around the world on the extent to which the Delta variant of SARS-CoV-2 is reducing the effectiveness of vaccines is generating uncertainty over the need, or not, for booster programs.

After seeing elevated alanine transaminase (ALT) levels consistent with drug-induced hepatotoxicity in its phase II study of ABI-H2158, Assembly Biosciences Inc. decided to discontinue development of the chronic hepatitis B virus (HBV) infection therapy.