vaccinated people were effectively zero. joining us now, dr. uché blackstock. she is an msnbc contributor. thank you so much for being here. it seems the vaccination makes symptoms milder if one contracts covid, but it does not entirely prevent you from contracting the disease in the first place. tell us a little bit more how it protects people from -- reduces the risk of getting ittal all, but does this mean that because vaccinated people can still get it, should we go back to how we were living? things like social distancing and not overcrowding rooms? >> right. first of all, thank you for having me. i think the discussion around breakthrough infections has been quite confusing for the public. what people should know in terms of the endpoints for the clinical trials, really we're looking at severe disease,