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. 2025 Jul 29;14(4):354–365. doi: 10.7774/cevr.2025.14.e37

Table 3. Results of the neutralizing antibody, anti-S antibody, and SARS CoV-2 IgG tests.

Characteristics GMT (95% CI) SCR (95% CI) GMFR (95% CI)
Neutralizing antibody (inhibition) test result
At least 2 doses of the vaccine
Day 0 7.5 (7.3–7.8) - -
Day 35 66.1 (65.3–67) 59.1% (58.0%–60.1%) 8.6 (8.3–9)
Day 180 39.3 (38–40.6) 46.2% (44.9%–47.6%) 4.7 (4.5–4.9)
Day 194 78.4 (76.9–80) 61.1% (59.3%–62.9%) 10.1 (9.4–10.8)
Day 360 78.6 (76.8–80.5) 60.0% (57.7%–62.3%) 9.9 (9.1–10.7)
All 3 vaccines
Day 0 8.5 (8.1–8.9) -
Day 35 68.9 (67.7–70) 56.9% (55.4%–58.4%) 8.1 (7.7–8.5)
Day 180 40.3 (38.9–41.7) 44.8% (43.3%–46.2%) 4.5 (4.3–4.8)
Day 194 84.3 (83.3–85.3) 61.6% (59.7%–63.5%) 10.6 (9.9–11.4)
Day 360 78.6 (76.8–80.5) 60.0% (57.7%–62.3%) 9.9 (9.1–10.7)
Anti-S antibody (QuantiVac) test result
At least 2 doses of the vaccine
Day 0 15.0 (14.6–15.4) - -
Day 35 239.8 (234.3–245.4) 79.0% (78.1%–79.8%) 15.6 (15.1–16.1)
Day 180 124.4 (118.3–130.9) 53.2% (51.8%–54.5%) 7.8 (7.4–8.2)
Day 194 433.8 (414–454.5) 77.4% (75.8%–79%) 27.5 (25.6–29.7)
Day 360 507.9 (477.7–540) 84.4% (82.6%–86%) 30.4 (27.8–33.2)
All 3 vaccines
Day 0 17.0 (16.3–17.8) - -
Day 35 253.3 (245.3–261.5) 78.4% (77.2%–79.7%) 14.9 (14.2–15.6)
Day 180 131.2 (124.4–138.3) 53.0% (51.6%–54.4%) 7.7 (7.2–8.1)
Day 194 490.3 (470.2–511.3) 79.1% (77.5%–80.7%) 29.8 (27.7–32.2)
Day 360 507.9 (477.7–540) 84.4% (82.6%–86%) 30.4 (27.8–33.2)
SARS CoV-2 IgG test result
At least 2 doses of the vaccine
Day 35 - - -
Day 180 0.6 (0.6–0.7) - -
Day 194 2.3 (2.2–2.3) 34.6% (32.8%–36.5%) 3.4 (3.2–3.6)
Day 360 2.8 (2.6–3) 47.3% (44.8%–49.8%) 4.1 (3.7–4.5)
All 3 vaccines
Day 35 - - -
Day 180 0.7 (0.6–0.7) - -
Day 194 2.6 (2.5–2.7) 37.6% (35.7%–39.6%) 3.8 (3.6–4.1)
Day 360 2.8 (2.6–3) 47.3% (44.8%–49.8%) 4.1 (3.7–4.5)

SARS CoV-2, severe acute respiratory syndrome coronavirus 2; IgG, immunoglobulin G; GMT, geometric mean titer; CI, confidence interval; SCR, seroconversion rate; GMFR, geometric mean fold rise.