A heterologous prime-boost, this type of vaccination induces “high concentrations” of antibodies that target the spike protein which covers the outside of Sars-CoV-2 has been proven to be safe i.e. people can safely receive a first shot of the AstraZeneca vaccine followed by a second dose of the Pfizer jab over a four-week period or vice versa and from the study An AstraZeneca-Pfizer combination induced higher antibody and T-cell responses than the Pfizer-AstraZeneca combination as countries faces shortage of supplies they can safely and effectively alternate the administration of different doses. Do you think that this information is contradictory considering earlier on mixing two covid-19 vaccines was highly discouraged ?
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