A prospective, randomized, comparative US trial of a combination hepatitisA and B vaccine (Twinrix (R)) with corresponding monovalent vaccines (Havrix (R) and Engerix-B (R)) in adults

In an open, randomized, multicenter, controlled clinical trial in the US, 7 73 adults were administered either a combination hepatitis vaccine (Twinrix : 720 EL.U inactivated hepatitis A antigen and 20 mcg recombinant hepatitis B surface antigen per milliliter) on a 0, 1, 6 month schedule or correspon ding monovalent vaccines concurrently (Havrix, 1440 EL.U/ml of hepatitis A antigen at 0, 6 months and Engerix-B, 20 mca of hepatitis B surface antigen at 0, 1, 6 months). Non-inferiority testing for the primary endpoint, seve re soreness, and equivalence testing for the secondary endpoints, anti-HAV seroconversion and anti-HBs seroprotection, showed that safety and immunoge nicity were comparable in the two groups. (C) 2001 Elsevier Science Ltd. Al l rights reserved.