From the Document: "WHO [World Health Organization] has published guidance on adjusting public health and social measures for the next phase of the COVID-19 [coronavirus disease 2019] response. Some governments have suggested that the detection of antibodies to the SARS-CoV-2 [severe acute respiratory syndrome coronavirus 2], the virus that causes COVID-19, could serve as the basis for an 'immunity passport' or 'risk-free certificate' that would enable individuals to travel or to return to work assuming that they are protected against re-infection. There is currently no evidence that people who have recovered from COVID-19 and have antibodies are protected from a second infection."
2020 World Health Organization. Posted here with permission. Document is under a Creative Commons license and requires proper attribution and noncommercial use to be shared: [https://creativecommons.org/licenses/by-nc-sa/3.0/igo/]
World Health Organization: https://www.who.int/