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. 2022 May 1;35(3):297–307. doi: 10.13075/ijomeh.1896.01878

Table 4.

Results of serological tests for SARS-CoV-2 in patients who had undergone a molecular (polymerase chain reaction – PCR) test for SARS-CoV-2 – data from 1696 municipal employees of 2 cities in Northern Portugal, assessed May 15–June 19, 2020

PCR test result Serological tests (N = 140)
total [n (%)] positive (N = 23) negative (N = 117)
n (%) 95% CI n (%) 95% CI
Positive 16 (11.4) 15 (93.8) 82.0–100 1 (6.3) 0–18.1
Negative 124 (88.6) 8 (6.5) 2.1–10.8 116 (93.5) 89.2–97.9