Given that the virus doesn't mutate very quickly, it would be extremely unusual to not become immune for a time being after infection. If, however, it's the a

Given that the virus doesn't mutate very quickly, it would be extremely unusual to not become immune for a time being after infection. If, however, it's the absolute worst case scenario that we don't get any immunity after infection and thus a vaccine is useless, then basically there's nothing we can do except build more hospitals and research treatments that prevent death. We would probably have to live a very different life going forward, ie. wearing masks all the time and other changes. In such a worst case scenario, at some point I would think our ability to detect the virus would become almost instantaneous, so we can have scanners/detectors at every entrance to allow for immediate detection and immediate quarantine. That would probably help keep the spread down immensely.