As individuals we need some reliable way to know if we are immune and not contagious. We probably also need some way to prove this to others. People who have th

As individuals we need some reliable way to know if we are immune and not contagious. We probably also need some way to prove this to others. People who have this status should be able to operate normally together with others and keep things running during a long lock-down. It wouldn't make sense to keep people locked inside if they can't catch or transmit the disease.