Table 1

Antibody level ratios for assays over time

Ratio median antibody level: assay positivity cut-off
                         Week
Pre-20201–23–45–89–1213–1617–2021–2425–2829+
EuroImmun−2.651.330.20.951.320.470.04−2.01−2.26−2.01
Roche−3.643.163.055.205.454.144.42−3.54−3.69−3.61
Abbott−5.541.64−0.511.120.860.08−0.59−5.13−5.13−6.13
Sample number (n=)2232010529020253111211
  • Antibody level ratios for assays over time show varying peak levels depending on test. Calculated by first establishing the median per time period, then calculating log2 ratio for each period versus each respective assay positivity cut-off.