 Warming triple digits further inland in Fresno and the central San Joaquin Valley. Highs up to 110 degrees. I'm Christina Onestad. I'll have more KPFA news at 8 o'clock. It is just past 7.33 in the morning. The show is up front. My name is Brian Edwards-Teekert. We're going to turn, as we do most weeks at this time, to new developments in the world of COVID-19. Our guest, Dr. John Swartzberg, clinical professor emeritus of infectious diseases at UC Berkeley School of Public Health. Good morning, Dr. Swartzberg.