Astra Zeneca Booster info

by Geronimo @, Playa Blanca, Sunday, January 16, 2022, 11:57 (127 days ago)

I am trying to find information of effectiveness of the Astra Zeneca after having the Pfizer vaccine for the first two vaccinations. I can wait and go to US for a booster if that is a better option. Has anyone found credible studies on Astra Zeneca booster????

TIA


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