Reinfection with a coronavirus is difficult to prevent, similar to how one can get a cold year after year, but this does not lead to death.

“it is a central question and i think our anecdotal experience again speaks to the difficulty of preventing re-infection with a mucosal pathogen like a coronavirus and that's why you know you can get a cold year after year but you don't die that long-term immunity you know prevents severe disease and we see that anecdotally”