The D614G mutation in the SARS-CoV-2 spike protein reduces S1 shedding and increases infectivity (2020-6-12)

https://www.biorxiv.org/content/10.1101/2020.06.12.148726v1

see also

https://edition.cnn.com/2020/06/12/health/coronavirus-mutations-scripps-gene/index.html

https://edition.cnn.com/2020/06/12/opinions/coronavirus-mutation-increased-infectivity-haseltine/index.html