KRT88P and infection: The salient findings of this study include 1) high prevalence of occult infection among the anti-HBc positive subjects, as well as the presence of seronegative OBI, 2) distinct differences with respect to subgenotype distribution and clonal diversity between occult and chronic HBV infection, and 3) potential association of OBI with HBV/D1 harboring a signature sQ129R mutation in its surface gene.