Subjects who had already been vaccinated with AstraZeneca and subsequently received a Pfizer shot had a 30- to 40-fold greater immune response than those who received a dose of AstraZeneca alone.
–
In addition, few serious side effects were reported. According to the researchers, combining these two vaccines is therefore “safe and effective,” the researchers said.
–
The so-called Combivacs study was conducted by the Carlos III Health Institute in Madrid.
–
