Table 1.
Comparison of different prevalence measures of SARS CoV-2 antibodies (unadjusted)
| Population | Positive SARS-CoV-2 PCR prior to studya | Anti-SARS CoV-2 seroprevalence (unadjusted) |
Participants with neutralizing antibodies tittersb | |
|---|---|---|---|---|
| Employees of the fire department Total = 745 |
Total of the sample % [95% CI] | 3% [1.7–4.1] | 5% [3.3–6.3] | 4% [2.4–5.1] |
| Total | 20 | 34 | 26 | |
| Number of those with positive by PCR prior to study (%c) | – | 14 (41%) | 11 (42%) | |
| Number of those who are seropositive (%c) | 14 (70%) | – | b | |
| Number of those with neutralizing antibody titters (%c) | 11 (55%) | 26 (76%) | – |
aSelf-reported SARS-CoV-2 infection (positive by RT-PCR) since February 2020.
bOnly in case of a positive Roche Cobas Elecsys® Anti-SARS-CoV-2 test, neutralizing antibody titter assay was performed.
cColumn percentages related to the total number with positive PCR or search or neutralization test.