The EPI in China started in 1978 with Bacillus Calmette-Guérin vaccine, oral polio vaccine, measles vaccine, and diphtheria-tetanus-pertussis vaccine, and it has since expanded to include hepatitis B vaccine in 2002, as well as hepatitis A, rubella, mumps, meningococcal meningitis, and Japanese encephalitis in 2007 [3]. The gene discussed is PPIB; the disease is hepatitis A virus infection.