Bettencourt, PFernandes, CGil, AAlmeida, AAlveolos, M2020-06-042020-06-042020-05-28J Infect . 2020 May 28;S0163-4453(20)30335-2.http://hdl.handle.net/10400.26/32494engInfecções por CoronavírusCOVID-19Testes SorológicosCoronavirus InfectionsSerologic TestsSARS-CoV-2Qualitative serology in patients recovered from SARS CoV 2 infectionjournal article10.1016/j.jinf.2020.05.057