One hundred thirty-three of 337 (39.4%) patients were already on a TDF containing ART regimen at the time of test, 166 of 337 (49.3%) were subsequently switched to TDF within median of 3.7 months (IQR 1.8–6.3) from hepatitis B test, and 38 (11.2%) were never switched. The gene discussed is PPIB; the disease is Hepatitis.