General Availability in Public Healthcare Institution Users are to consult the respective PHIs for actual inventory availability and supply restrictions/consideration Twinrix Injection, Hepatitis A Virus Antigen (Inactivated) 720 elisa units/mL + Hepatitis B Surface Antigen (r-DNA) 20 mcg/mL Changi General Hospital Khoo Teck Puat Hospital Ng Teng Fong General Hospital Singapore General Hospital SingHealth Polyclinics Tan Tock Seng Hospital Woodlands Health Campus