[flatbutt]

Studies on mixing vaccines info. Apparently this has been under study since at least May of this year.

https://www.nature.com/articles/d41586-021-01359-3

https://www.nih.gov/news-events/news-releases/nih-clinical-trial-evaluating-mixed-covid-19-vaccine-schedules-begins

https://www.reuters.com/business/healthcare-pharmaceuticals/who-warns-against-mixing-matching-covid-vaccines-2021-07-12/

https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines-us.html