Table 6.
Quantitative serology results for primary and secondary cases in relation to illness onset date (first symptom onset or first positive test for asymptomatic individuals), California and Colorado, January–April 2021. Individuals who received a vaccine dose after illness onset (n = 27) are excluded from analysis.
|
Geometric mean antibody titer (±geometric standard deviation) log BAU/mL |
||||
|---|---|---|---|---|
|
Anti-Spike |
Anti-Receptor Binding Domain |
|||
| <14 days after illness onset | ≥14 days after illness onset | <14 days after illness onset | ≥14 days after illness onset | |
| Fully Vaccinated (n = 9) | 464.3 (3.9) | 1437.1 (2.1) | 672.5 (4.0) | 2238.6 (2.3) |
| Partially Vaccinated (n = 8) | 609.2 (3.5) | 1854.4 (1.8) | 528.8 (5.5) | 2799.5 (1.9) |
| Recently Vaccinated (n = 11) | 106.8 (25.1) | 1247.3 (4.7) | 83.5 (26.5) | 1266.2 (7.3) |
| Not Vaccinated (n = 253) | 1.8 (10.4) | 123.2 (5.6) | 3.8 (8.1) | 99.1 (6.1) |
Xx Abbreviation: BAU – binding antibody units.