Dr. Peter Attia podcast from March 30. Infectious disease Dr he interviews (worked on SARS, E Bola and others) said some they tested had 1000x the contagion before symptoms or when slight symptoms showed. It's very long, over an hour, but informative and has new information.
https://podcasts.apple.com/us/podcast/the-peter-attia-drive/id1400828889
Edit: One thing discussed in this podcast, aerosol that carries the virus is more dangerous than we know. I went for a long walk at a huge park in our area. Did not wear a mask. People jogging, walking fast and talking, laughing in groups passed me.
I started to hold my breath as I was listening to this podcast until they were way past me. Joggers clearly express aerosol, breathing heavily. I'll be heading out to remote areas for long walks from now on, where there are no people if I"m without a mask.