Canada

Safety, immunogenicity and reactogenicity of BNT162b2 and mRNA-1273 COVID-19 vaccines administered as boosters with a fourth dose after two doses of ChAdOx1 nCoV-19 or BNT162b2 and a third dose of BNT162b2 (COV-BOOST, blind phase) study: 2, early

SARS-CoV-2 anti-spike protein IgG concentration, ELU / mLD day 28 after the third dose23 325 (20 030–27 162); 6625 317 (20 996–30 528); 6620 502 (16 473–25 517); 3521,980 (16,476–29,324); 3326 982 (22 056–33 008); 3129 161 (23 093–36 823); 33Day 0 of the fourth dose3049 (2550–3646); 663469 (2730–4407); 662532 (1974–3247); 352571 (1874–3527); 343761 (2959–4780); 314769 (3421–6648); 32 Day 14 after the fourth dose37 460 (31 996–43 857); 6554 936 (46 826–64 452); 6733 316 (26 942–41 198); 3552 080 (41 163–65 894); 3442 949 (34 148–54 019); 3058 043 (46 693–72 150); 33 Change in times (day 14 after the fourth dose versus day 28 after the third dose) 1 · 59 (1 · 41–1 · 78); 652 · 19 (1 · 90–2 · 52); 661 · 62 (1 · 35–1 · 95); 352 · 41 (1 · 90–3 · 05); 331 · 54 (1 · 35–1 · 76); 301 · 99 (1 · 71–2 · 31); 33 Change of times (day 14 after the fourth dose versus day 0 of the fourth dose) 12 · 19 (10 · 37–14 · 32); 6515 · 90 (12 · 92–19 · 58); 6613 · 16 (10 · 24–16 · 91); 3520 · 26 (15 · 09–27 · 21); 3411 · 14 (9 · 21–13 · 47); 3012 · 30 (9 · 39–16 · 11); 32Cell response (wild type), spotting cells at 106 PBMC *

Due to logistical reasons, only 50% of the study sites collected samples from cellular immunology (close to an external laboratory) in the main COV-BOOST study; samples of cellular immunology after the fourth dose were collected in the immunological group.