When there is uncertainty as to the accuracy of antibody tests and uncertainty as to whether catcthing the virus gives subsequent immunity, there would seem to be quite a mountain to climb. Lockdown reduces infection rates it does not prevent it.
Until a vaccine is made available for all, a degree of permanent lockdown would appear to be a feature of life for the near future. Either that or perhaps swamp medical facilities and have a heightened death rate.
It seems to me a immediate profitable line of research would be to isolate those that have/have had the virus asymptonatically and determine who shares the same characteristic in the entire population. Answer this and lockdown could be focused on those that do not posess this apparent immunity.