When COVID-19 burst on to the scene, tests quickly showed that the everyone was susceptible - no pre-existing antibodies were found that bound to the SARS-CoV-2 virus. This led to dire predictions that over 80% of the population might eventually fall ill. Now more than six months in, this has not happened, and it does not appear to be close to happening. A few months ago, noted virologist Christian Drosten mused in his (German) podcast that some people might have a level of immunity after all, but he wasn’t yet sure.