No immunity. but they develop antibodies. More info here: "FDA is working on treatment of coronavirus with blood from recovered patients" "The method — essent

No immunity. but they develop antibodies. More info here: "FDA is working on treatment of coronavirus with blood from recovered patients" "The method — essentially harvesting virus-fighting antibodies from the blood of previously infected patients — dates back more than a century" https://www.nbcnews.com/health/health-news/fda-working-treatment-coronavirus-blood-recovered-patients-n1165231 https://www.nbcnews.com/health/health-news/fda-working-treat...