Abstract:
BACKGROUND:Sci-B-Vac® is a tri-antigenic recombinant Hepatitis B vaccine (TAV) containing the small (s), medium (pre-S2) and large (pre-S1) hepatitis B surface (HBs) antigens. To comply with vaccine licensure, a new reference standard batch was qualified by characterizing the seroprotection rate (SPR) for anti-HBs titers ≥10 mIU/mL, following vaccination. METHODS:Ninety-one healthy adults aged 20-40 years were enrolled in an open label, single-arm phase IV study receiving three IM doses of 10 μg TAV at 0, 1 and 6 months. Immunogenicity was evaluated monthly and at 7, 9 and 12 months. The primary endpoint to qualify the reference standard was an SPR ≥95% by month 7. Secondary endpoints were proportion of high responders (anti-HBs titers ≥100 mIU/mL) and geometric mean concentrations (GMC) of HBs antibodies each month. Participants were followed for safety to month 12. RESULTS:The primary endpoint was met 2 months after the second dose at month 3 [SPR 98.8%; 95% CI: 93.7%, 99.7%]. Proportion of high responders at months 3 and 7 were 81.4% and 97.6%, respectively. GMC at months 3 and 7 were 413.6 mIU/mL and 6799.9 mIU/mL, respectively. TAV was safe and well-tolerated. CONCLUSIONS:The new reference standard batch of TAV was qualified successfully, demonstrating efficacy, a favorable safety profile and a rapid onset of seroprotection, including after two vaccine doses. Clinical trial registry: NCT04179786.
journal_name
Vaccinejournal_title
Vaccineauthors
Atsmon J,Machluf N,Yayon-Gur V,Sabbah C,Spaans JN,Yassin-Rajkumar B,Anderson DE,Popovic V,Diaz-Mitoma Fdoi
10.1016/j.vaccine.2020.12.050subject
Has Abstractpub_date
2021-01-13 00:00:00eissn
0264-410Xissn
1873-2518pii
S0264-410X(20)31630-3pub_type
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