“Purely theoretically, a mix of vaccines with an AstraZeneca first dose and a second mRna dose might work even better, because AstraZeneca also works by inducing an anti-adenovirus response, while the messenger RNA used by Pfizer only invokes the response. specific anti-Covid. I also add that this combination could solve the block of some (fortunately few) who give up the second dose for fear: the final goal is not to force the population to vaccinate, but to have the maximum possible coverage “. Antonella Viola, immunologist at the University of Padua, underlines this on Facebook. The scientist recalls “a recent Spanish research” that “monitored 670 volunteers aged between 18 and 59 who had already received a first dose of AstraZeneca (a viral vector vaccine) and who subsequently had Pfizer (a vaccine to Rna messenger): the side effects were not different, on the other hand it seems that the mix has increased and enhanced the antibody response. Similar results come from the United Kingdom “.