Recently, the first studies evaluating several commercial serology assays have been published. Geurts van Kessel et al [17]. studied three rapid tests, four ELISAs and a high throughput chemiluminescent assay. Sensitivity ranging from 81–100% was calculated by using a total of 187 sera from 107 RT-PCR confirmed COVID-19 patients. Specificity was determined using 147 serum and plasma samples from individuals exposed to human coronaviruses and other respiratory viruses with values ranging from 85–100%. Similar to our findings, the performance of the Liaison SARS-CoV-2 S1/S2 IgG (DiaSorin) was worst with a sensitivity of 81% (compared to 59% in our results) and specificity of 90% (compared with 100% in our results). The group of Haselmann et al [16]. evaluated the performance of two IgG ELISA assays and one IgG electrochemiluminescence immunoassay (ECLIA) based on 51 serum samples from 26 COVID-19 patients and another 51 serum samples from control patients. They report a sensitivity of 92–100% and specificity of 84–96%. The Austrian Red Cross Blood Service [15] evaluated 100 SARS-CoV-2 convalescent plasma donors and SARS-CoV-2 antibodies were characterized using three different IgG-ELISAs (EUROIMMUN IgG and NCP-IgG ELISA, Wantai ELISA), two CLIA (Elecsys, LIAISON) and two lateral flow tests (MEDsan IgM/IgG-Rapid-Test, Wantai Rapid Test). The Wantai ELISA and the Elecsys provided the highest sensitivities in this sample (98 and 95 % respectively). Serrano et al [18]. compared the performance of 3 lateral flow immunoassays (IgM/IgG combined) to 2 ELISAs (IgA and IgG) in serum samples from 109 RT-PCR confirmed patients in different weeks after symptom onset. The IgA ELISA was most sensitive the first week after symptom onset (71%). The sensitivity improved to 97% for IgA ELISA in the second week. In the third week IgA ELISA, IgG ELISA and 2 out 3 IgG lateral flow tests had a sensitivity of > 96%. The lateral flow immunoassays showed variable performances. Pieri et al. also found that IgA detected by the ELISA assay might be a more reliable and stable early serological marker than IgM. Instead, IgG, as expected, showed stable level after 10 days from symptoms onset [21]. These findings are in accordance with our study results.