Just when there was a palpable sense that everything might be OK, the highly contagious Delta variant of COVID-19 came along. The race to vaccinate more people is now even more urgent; healthcare workers who are seeing more patients say another surge is entirely preventable, if only more people would get vaccinated.  Guest: Lesley McClurg, KQED science reporter Read the episode transcript here. Follow The Bay to hear more local Bay Area stories like this one. New episodes are released Monday, Wednesday and Friday at 3 a.m. Find The Bay on Apple Podcasts, Spotify, Stitcher, NPR One or via Alexa.