In April this was the situation, the WHO did not think immunity passports were feasible https://www.who.int/news-room/commentaries/detail/immunity-passports-in-the-context-of-covid-19
In April this was the situation, the WHO did not think immunity passports were feasible https://www.who.int/news-room/commentaries/detail/immunity-passports-in-the-context-of-covid-19