This is reply of another postAccording to the World Health Organization (WHO), A second dose of Pfizer or Moderna can be used after a first dose of AstraZeneca in some situations.
WHO's claim is controversial as almost 20 countries has banned AstraZeneca vaccine, these countries including Thailand and other majority of European countries: Austria, Bulgaria, Romania, Germany, Lithuania, Latvia, Sweden, Norway, Denmark, Iceland, Netherlands, Ireland, France, Span, Portugal, Luxembourg, Italy, Slovenia and Cyprus.
WHO further claims, Research is underway to understand whether COVID-19 vaccines can be safely and effectively mixed-and-matched. Emerging data shows that following a first dose of AstraZeneca with a second dose of an mRNA vaccine (Pfizer or Moderna) is safe and effective where supply is limited
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