Chile plans to issue the world’s first immunity cards for people that have recovered from coronavirus to signal they are no longer contagious and can return to work and their normal lives. The government will start issuing the “Covid-19 cards” next week, Health Minister Jaime Manalich told reporters Thursday, setting out a strict set of criteria for the new permits. The measure may prove controversial, though, as some of the cards will be based on the presence of antibodies to the virus, for which countries have struggled to mass produce reliable tests. Manalich said the government would ensure that “with a very high probability” that people with the cards were no longer contagious. There is also concern that the new system will lead to a black market for the cards.