US launches study mixing COVID-19 booster vaccine regimens
https://healthell.blogspot.com/2021/06/us-launches-study-mixing-covid-19.html
US launches study mixing COVID-19 booster vaccine regimens

The National Institutes of Health (NIH) has initiated an early-stage study testing mixed COVID-19 booster vaccine schedules among fully vaccinated adults. The goal is to understand safety and immune responses following mixed boosted regimens.